1)0 Business allure...no business wanted (or even today) Macs...wicked expensive (comparatively), 0 business app support, and 0 business class Tech Support
That's called.... stupid businesses, not an Apple problem. I was an IT consultant during Apple's worst years, and my Mac based clients got far more out of their computer systems than did the PC folks. Yes, they did cost more, but compared to HR, they are cheap either way. A computer is a tool, used by a human... a more productive tool equals a more productive person. The computer pays for itself in a few weeks. There were also plenty of business apps. My customers weren't left wanting for sure. Yes, on the high end, they didn't have the service arrangements like HP or others had (where an HP tech shows up and swaps out servers, etc.) but most companies don't really need that.
2)Macs stayed expensive while Wintels got cheaper and cheaper and cheaper as each year went on. Cheaper may not essentially mean better, but when you're talking 1/2 or 1/3 the price, people vote with their wallets...especially if 90% of the rest of the world is choosing Wintel.
First, you don't get a comparable computer for 1/2 or 1/3 the price... apples to oranges (no pun intended). If you take specs into consideration and care at all about quality (so you don't have to buy another one in 1/2 to 1/3 the time), Macs have typically been 10% to 50% more depending on the model. The only time you get into the range you're talking about is if you take the top 'Pro' models and load them up with Apple options (which the magazines often did to ensure the price advantage of the Wintel hardware).
It's also irrelevant if 90% of the world is using X, so long as the remaining 10% is enough market share to drive the software development needed. Apple has always had enough market share for that. There were a few years in Apple's darkest time when some of the software devs began to jump ship. If that had continued, it could have become a problem. It never did.
3)Apple proprietary methodology (works great for consumers) keeps business-class apps, hardware, support, and services away...thus again businesses wouldn't buy Macs. I am referring to the Mac OS, its licensing, the fact that you must run it on Apple hardware, etc.
Yea, it kept some stupid developers away. They were mostly speciality apps that weren't needed unless one was in some very specific discipline. For those cases, just use a Wintel box. I had a few Mac clients in areas like CAD that had a few Wintel boxes for that when they needed AutoCAD or stuff like that (even though there were better CAD apps available on the Mac at the time... like Ashlar's products.)
Having to run Mac OS on Apple hardware was never a problem, but a blessing. The WORST move Apple ever made was when they started to license it to the clones. That was one of the idiotic things the 'experts' were all recommending at the time. It was one of the things that might have done Apple in eventually.
4)As my wife puts it: "Macs are fine...but Apple only wants to sell you Apple."
I hate to insult your wife, but huh? I'm not seeing the point or the problem.
5)Apple was a computer company...they "innovated" by becoming a consumer electronics company (iPod is what saved Apple). Innovating (by changing to a different company) helped...but that's like saying Nike all of a sudden barely sells sneakers and "innovated" by selling prescription glasses. Until 1999, Apple sold computers, printers, mice, monitors, and a handful of applications. From 1999 till present, Apple concentrates on iPods, iPhones, iTunes music purchases, newly-added iPads, and the revenue from AppStore sales. Macs are being purchased at "historic" levels, but Macs are clearly not Apple's direction (as of 2010/2011) and still sit at about 9% adoption rate for consumers worldwide...I think Apple has a big identity crisis with the Mac...and has had this crisis since 1999.
Umm... that's because Jobs understands how these trends work. For example, Windows didn't get in the server room by being good. It got into the server room by making it into enough homes and CEO and IT people's personal computers. The true IT folks hated Windows initially for anything but the desktop (and most thought it silly there as well, but the users wanted it).
Companies and IT (especially big ones) are usually pretty dumb in their technology choices. They copy other big companies in hopes of not getting blamed for picking the wrong thing. If you can point to some other company using product X, you can save your butt. It is the innovative companies who implemented Apple products because they didn't have to cover their butts by using the 'norm'. Consider the widespread use of Lotus Notes in big companies (I rest my case!).
By getting Apple into the hands of the average consumer, even the most die-hard Apple haters eventually had to start recognizing that the iPod and then iPhone were pretty good products. If they were so good, maybe Macs deserved another look as well. With the move to OSX, it also gave people an excuse to take another look as Apple was now more 'pro' with the Unix underpinnings.
Today, since you can run Unix, OSX, Windows, etc. on a Mac, and the hardware is so good, there is hardly any good reason not to use a Mac. In my last IT role (in a Fortune 100), all the top execs used Apple laptops loaded with Windows. The only division of the company that was growing through the rough years after 2001 was using Macs for the whole development team and most of the IT team.
The reason Apple isn't more widely used in business is largely because of close-minded IT and tech folks. Pretty simple really.