I find this quite an interesting topic. I currently bought Skyrim, my previous purchase was Dragon Age: Origins in 2009 (and played for about 4 hours). I play mainly RPGs with some FPS, and probably clock around 30+ hours a week.
Alternately, I have a friend who buys almost any game on Steam, but mainly puts in around 8 hours a week gaming.
I tend to keep to the older games as I find myself increasingly not in the demographic (I guess) for current titles. Firstly the only game I play on my PS3 is GT5, everything else is on PC because I hate controllers. Secondly, I like difficult games, not generally fast paced (more thought than trigger).
So how do you stack up? How many games do you complete/buy a year? (I will complete Morrwind, Oblivion, Skyrim, Titan Quest a million times (550 hours this year), maybe Sacred 2 again).