In my case, and probably a few others, it's a function of what role the PC plays overall. In my situation the PC controls everything. Whatever TV show, sporting event, movie, or music I'm listening to is coming from the PC. I'm also online quite a bit (obviously). And it's configured such that I can do any 3 of these things at the same time, though I seldom do; movie on the big screen, game on primary monitor, DTF/email on secondary monitor. For me, getting the Xbox fired up would be an undertaking, and everything else happens seamlessly.
I will say there are some console games that simply don't exist for PC, and I certainly wouldn't mind playing some EA Sports titles.