And (not to dis console gamers), spending a chunk of change for something that my PC does better doesn't really ring my chimes.
What about HD compatability, and being able to play on your TV on a couch, with a wireless Xbox Controller? (i know these things are possible on PC (not sure about wireless controllers, but i wouldn't be surprised), but they aren't as practical, and add to the cost of playing on a already very expensive PC)
My computer is 3 years old, and it cost 700 dollars at the time. despite it's cheapness, it can do everything I need, other than current-gen gaming... I got a 300 dollar xbox for that. totaling 1000 dollars, for a computer, and a gaming system, instead of a computer that is also a gaming system.