Seriously, why would anyone play games on a console anymore? You can do so much more to your games on the PC.
That wasn't directed at me, but here are my reasons:
1) I don't want to have to dual boot so that I can play AAA games. It saves me a Windows license, the hard drive space, the annoyance of multi-booting, etc.
2) Being able to just sit down on the couch with a beer, pop in a game, and play it lounging back without having a keyboard/mouse spread is relaxing. I do love playing PC games as well, but sometimes I just want to be sprawled. If I played competitively, I'd probably only play on PC.
3) I'm growing older and don't have the time or energy to upgrade my hardware in bits. I'd rather buy a new console for a few hundred dollars every 5-7 years instead of component upgrades every 0.5-1 years.
It also helps that my gaming isn't mostly twitch-shooters. If it was, that would also change how I probably played games.