I wish I was like many of you, and trade/sell a game when I'm done with it.
Sadly, the "collector" bug bit me when I was 4, and it is difficult, if not impossible, for me to not hoard things.
It's either that or crack.
I just bought the 360 like two weeks ago, and am already up to maybe 8 games, 5 XBLA titles, a couple pre-orders, and several more likely to come in the EB B2G1F deal this weekend.
But seriously, I may never play most of them, since GOW and Oblivion are so freaking amazing.