compare Apple to a BMW? Give me a break....
I think that when most people compare Apple to BMW they are comparing the price and the perceived value of the whole system, not the quality of the hardware.
I bought a Mac mini because I wanted to switch to Mac OS X. Yes the Mac mini is more expensive (if only because it uses laptop parts), yes it's less powerful in some areas than my old PC (especially the GPU), however it does run OS X, which is what I wanted.
Are Apple computers more expensive? Yes they are (let's not embark on the whole "software value" debate again, thanks in advance). Is Mac OS X better than the other operating systems? That's a personal decision that people have to make for themselves, and vote with their wallets.
However, after a little more than two years using a Mac mini, I find regular PC towers to be extremely noisy and annoying. Heck, my external 1TB drive makes almost four times as much noise as my Mac mini!
That's my opinion/point of view of the "Apple = BWM" comparison.
However, some people really seem to believe that Apple has "better hardware" when in fact what makes OS X stable is that Apple has a specific, limited range of hardware to test on for the QA. The intel CPU inside your intel Mac is the same as in other PCs, the hard drives, RAM, chipsets are also the same. The only real difference between an intel Mac and a PC is that intel Macs use EFI while most PCs still use BIOS.
Oh, and PCs can't help but be ugly because of the front bays for 5.25" and 3.5" drives.