Personally, I don't give a hoot about Apple itself. If they make a good product at a fair price, I buy it. I bought an iPod Touch and two AppleTV units, but I bought my Mac USED because a MacMini just isn't for me. I needed a tower with internal storage. I would have bought a new one, but that would have meant a MacPro, which is insanely high priced for what I actually need a tower for and yet there are no other options from Apple. Oddly enough, a Psystar or Hackintosh would have fit the bill for about the same price as upgrading an old PowerMac and would have had considerably more power. Yeah, I feel a little stupid for buying the used Mac when I could have made a Hackintosh. I would never buy the MacPro, though, because it's way overpriced as a consumer desktop machine and iMacs simply don't interest me with no options for clean internal storage (I don't want to mess up the top of my desk).
So, as you can see, personal feelings can sway either direction. You can love Psystar or you can hate it, but there is no denying that if they win the case the consumer will win too with lower official prices and plenty of alternatives to Apple's overpriced hardware.
You can argue their OS cost them X amount to make, but then you're just telling me that OSX is undervalued. Given they tend to make you buy a $129 update every 1-2 years on average, I don't really believe it's undervalued. Look how much longer shelf life you get out of Windows. It costs more, but you don't have to buy an update every 1-2 years either so it ends up being the same thing when all is said and done. So do you want Windows Ultimate Vista for $400, which will last you the next 4 years or do you want to pay $129 every year for the next 4 years? It's your choice, but it costs about the same. Snow Leopard is set to be released next year with "no new features" but I bet it costs the same $129 to get it all over again.
First off, you have to remember what the Mac Pro really is before you can call it overpriced. Two 8-core Xeons? A 320 gig hard drive, 2GBs of fuly buffered RAM, and a case that goes for $480? I recently did a comparison of a Mac Pro and a computer with as similar specs to a Mac Pro as I could find. I found all the parts at NewEgg, except the case, which I found on this site, the keyboard and mouse, which I got from Apple, and the OS and iLife, which I also got from Apple. All in all, it came out to being only a hundred dollars less than a base Mac Pro. And what do you get for that extra hundred dollars? You don't have to spend time building a machine, getting the OS patched and installed, getting around updates, having LAN ports not work, whatever. If I were in the market for a computer in that class, I would not look any further than a Mac Pro. I understand that you didn't need something with that much power, and I understand that. The only point I'm trying to prove is that the Mac Pro is not overpriced for what it is.
Also, Microsoft is already working on Windows 7. It should be out next year, two years tops. If you buy a copy of Vista Ultimate (which really stands for Ultimate Profit, btw-- it's insanely overpriced for what it is), it will be out of date in about a year. When Gates was in charge, he even admitted that a new OS should come out every 2.5 years or so, and that XP was way overdue. You're basing your statement that Vista will last you four years based on an exception. You could make the argument that you're not forced to upgrade Windows every time a new version comes out, but the same goes for OS X as well. The thing is, it's just so cheap, that it doesn't hurt the wallet that badly to upgrade every year or two, therefore most people do. But they don't have to. And while Snow Leopard will have no new features, it will have many bug fixes, and it should be a lot faster and a ton stabler. Let's see Microsoft accomplish that....