Computers crash, or I’d have voted for them.
That, and the fact that switching an Xbox disc out and popping in a new one is way easier than installing programs, directX, deleting the old games that you don’t play anymore, defragmenting the hard drive, restarting, closing all the programs that I have open at the time, and then playing the game with my fingers crossed hoping that it runs.
I’ve got PS2 right now, but … I dream of an Xbox … ah!