Long post is long..
There simply is no large group of Apple consumers who want a mid-tower. You are just wrong about that. Sorry to be the one to tell you.
Who knows! Anecdotal evidence seems to support there are a lot of these people. Apple used to have cheaper tower prices. Apple never used to have the ability to run Windows. It's a whole new ball game now, and Apple should be supporting one of the biggest (in terms of revenue) creative industries in the world. If they don't get on the gaming
and game development badwagon they're shooting themselves in the foot. The EA, id and Epic stuff all points to Apple trying to rectify this.
The only time Apple have done a mid-tower-alike they charged *more* for it than a comparable PowerMac. There's no way of telling how many people want this configuration - the size of the potential market doesn't in any way affect how valid their wants and needs are either way.
It could attract more upgrades from old Mac setups, and entice new users. Also, gamers are as important as anyone else. I indy develop and am doing degree games design - Almost everyone on my course would be interested in an affordable gaming-friendly work Mac - especially now they can run windows too (and thus 3DStudio Max etc), the *only* thing stopping them considering a switch is that the entry level for a desktop machine with significant power (enough for productivity and gaming) is through the roof.
It's also untrue that many people *ever* upgrade their computer beyond a stick of memory and (maybe) a new video card.
People might want a smaller machine because it costs less and uses up less space, they don't just want a mid-tower for upgradeability reasons. I upgraded my PowerMac's HDs, Ram and video card, added a couple of USB cards - it only needs a similar level of upgradability - no replaceable motherboards, nothing particularly difficult for Apple to pull off considering they support a lot of the video cards on the market already. People have every right to want to keep their *good* (or potentially terrible, their call) monitors.
Here I think your smoking something pretty weird. If there ever was a demographic that is almost the complete opposite of the average Mac user it is the average "gamer." X-Box goons are noteworthy for their Apple bashing and their fierce unreasoning loyalty to Microsoft if nothing else, and the majority of PS3 users are Japanese. Japan is one of the only markets that Apple has difficulty in and has one of the highest Windows penetrations of any market AFAIK.
You're accusing me of smoking something then completely misrepresenting the market. Average gamers vs average mac user isn't the issue. Apple could gain a lot of users by appealing to gamers. Apple does really well in Japan. Better than it does in the US. It only takes looking at their media to know the Mac has huge penetration there (side-note, watch any anime and the chances of seeing incidental Macs over PCs is massive). Or adding up the number of Apple stores there, or looking at the sales of iPods etc. Hell Leopard even outsold windows throughout October..
I wasn't suggesting competing with the consoles. There *are* a lot of people who buy PCs for gaming, it's a substantial industry in its own right.. Alienware & Dell cater for this audience and they're doing ok. When people release a decent game for the Mac (WoW, COD etc) they sell.. They'd sell better if there was a "middle" option.
One of the reasons a mid-tower is not a good idea is that the sales of the all-in-ones that fill this niche is through the roof. Making an argument that a product they are literally shoveling out the door should be replaced by a different one and claiming that the furious sales of ... well the machine that is selling, is irrelevant, is just nuts.
By past sales of similar machines I specifically meant the Cube - it's the only thing Apple have made that fits. The reasons it didn't sell are obvious and don't really apply in the current marketplace. I'm saying the iMac doesn't fill the niche for a lot of users. There is potentially enough room in the lineup for another machine. The iMac is a beautiful machine which does what it sets out to perfectly - I'd never argue against that. One of the things it's not setting out to do though is "mid desktop" or "normal gaming" - nor is the MacPro.. I'm saying the iMac isn't selling as well as a combination of an iMac+Mid tower would sell. Different strokes.
You are ignoring the obvious. Apple is already "doing it right" with the iMac and the sales prove it. A more important market segment to measure if you want to support your argument is those people who *did* want a mini-tower,
Apple can do more than one machine right at a time.

I can't "prove you wrong", but you seem to be going on the assumtion that Apple are reaching maximum sales rates, which I don't think they're even coming close to.. The fact that the Mac platform is selling amazingly in current configs doesn't mean it couldn't sell better if they had a more complete lineup.
Back to the gamers -
none of them are likely settling for imacs, so they're not ever getting a chance to go "oh, this is okay after all!" - they look at the mobile components and
buy or build a windows pc. (or if they're lucky, a MacPro and dual-boot)
You are wrong about the ACD's also, they are almost the best monitors you can get, and for what you get they are good value.
I never said anything negative about the ACDs. You're seeing everything in a much more black/white way than I'm actually writing. Lets repost what I said about the ACDs:
I have a dual LG monitor set-up. I wouldn't pay extra for Cinema displays - i would if I had money to burn. Apple aren't the only people who can make good monitors - they use the same panels as everyone else.
That is NOT wrong. I do have nice LG monitors. *I* wouldn't pay extra to replace MY LGs. There are a lot of people with good monitors out there. Apple use the same panels as other high end monitors. (Dell, Viewsonic, etc) Which frequently cost less. .. Personally if I *was* in the market for a new monitor I'd consider a ACD .. Once they support HDCP.
but the majority of users that would be happy with a mid-tower would also be happy with some Ben-Q POS monitor and not even see a difference. These consumers are not Apple's market.
Other manufacturers displays frequently trump Apple displays in review round-ups. Being Apple-produced doesn't inherently make something worth everyone replacing their stuff if they already have equal
or better at home. The HDCP issue will be a big one once BD takes off. A significant number of creative pros/illustrators need pivoting monitors also, Apple offers nothing for them. Are they wrong to want the option? So many users around here seem to have the attitude that
if Apple don't accomodate you already you should just shut up or use Windows.
Also, in film, CG, photography etc - the guys running Windows (still the majority) spending vast amounts on software, SLR lenses etc.. If Apple monitors are so much better I'm sure they'd upgrade to them across the board considering their livelyhoods depend on good colour reproduction etc. They don't, because other manufacturers make just as good displays. (even if they sometimes aren't as pretty and might not offer the same build quality) - That's beside the point though, ACDs are great but I shouldn't be expected to dispose of perfectly good widescreen monitors which got great reviews.
Another really good sales-based reason for *not* doing a mid-tower is that it would take away from the sales of the existing segments.
The profit margin on the MacPro hardly looks likely to be massive considering the specialist parts. A Mid-tower would be made of some of the most commodity parts on the market.. The amount it could bring in new users may outweigh any lost imac profits. It would be a gateway mac like the Mini is, but for somewhat more-tech savvy/demanding users, and an amazing upgrade path for a lot of people who need more grunt but don't want or need a £2000+ machine.
If the iMac is selling like hot-cakes with a customer satisfaction rate that is through the roof (it is), and if the MacPro is doing similar gangbusters (it is), why would you introduce a new model that would eat into the sales of both?
They've introduced things that threatened to cannibalize other devices before. People said the same things before the Mac Mini was introduced. They said the same before the iPod touch was introduced. Nobody here can claim to know exactly what Apple is thinking, or even what's best for them. It's not totally unfeasable they'd try a middle option. People underestimate what they'd be able to do with it, I think. Just because other manufacturers' aren't compelling doesn't mean Apple couldn't do it well. (Same applies for tablet Macs)
If it does exist, I don't think it's large enough for Apple to throw away money on.
That's probably true. But the vast majority of desktop sales still aren't all-in-ones, and the MacPro isolates a lot of people. Maybe it is a significant number. Maybe Apple have weighed up the pros and cons, and despite knowing it's a significant audience - aren't doing it anyway - That doesn't mean it wouldn't be good for the userbase (and environment) if they did.
lol EPIC REPLY, sorry. I'd thoroughly expect these posts to be moved to some far-off mid-tower debate thread..
Personally I'm probably just going to get an Octo MP.. I love the casing, and the speed will be nice for rendering etc.