The argument isn't about it being a "personal computer," it's more about the compatibility. Yes, you could install Windows on a Mac and have the compatibility, but, then you just bought an overpriced PC. Apple prides itself on it's OS, which is quite lean by comparison to be fair. But, you can say Apple can do anything a PC can all day, I have a few dozen CD's that beg to differ. Different software, games, etc. My friend who is just obsessed with apple asked to borrow a few of them, arguing that it'd work cuz Mac's can do anything. Easiest bet I ever won, I tell ya.
Anyways, I digress. The difference between a "PC" and a Mac are the OS. At least where most people are concerned. That's the difference. Is it big? No. Does it cost a premium? Yes. Is it worth it? I don't think so, but, I can't know much. Only been using computers for about 26 years. I'm not hating on Mac lovers, I'm just saying the looks of a computer shouldn't dictate a 50% price increase, IMO. So ends my opinion on the matter. Back to your love/hate comments.