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The reason I bought a Mac was that it was the only system that I know of that both:
1) Runs real MS Office so I can exchange spreadsheets and word docs with others *completely* transparently.
2) Has Unix (TM) inside.
3) Has no *other* MS software (MS sofware is ludicrously open to Trojan horses) :-)
I've played with Linux as a desktop OS, although it was a few years ago, and it was painful -- the UI was pretty ugly, it was a pain to set up, and I never convinced myself that I was running the best drivers for my graphics card. It may well be better these days, but there's still no Office for Linux.
But there's no doubt in my mind that I paid something significant, at least 25% more, for the luxury of getting exactly what I wanted.
BTW one reason I suspect Macs hold their value better is that, really, you're paying partly for a software release that includes Unix and allows you to run Office, and software holds its value much better than hardware.