I am (or was; what I'm about to say might disqualify me) a computer geek, and I don't usually bother purchasing an add-in card or CPU upgrade these days.

I do appreciate the ability to spec out what I want in the PC at purchase time (either from Dell, for example, or because I'm building it myself), but once it's built, it tends to stay that way.

I did buy a new graphics card for my desktop PC recently, but if that hadn't been an option, I'd have just bought a new PC. It wouldn't have been a Mac, though.