I've only sold a few games that I've owned. They were games that I played a bit and just had no interest in and could at least get a reasonable amount back. The think I won't do though is buy used games from them if I can still buy the game new somewhere else. It makes no sense to buy a used game if it's only a few dollars cheaper.
If the game is $60 new somewhere and Gamestop has it for $55 used, why would I buy it used just to save five dollars? If saving five dollars is that important, I'll wait till it's on sale. I bought GTA4 for $37.99, Madden 09 for about the same price. And this week, I might buy Smackdown Vs. Raw and or Saints Row 2 for $39 each. The prices for all of those four (and there are a bunch of other sales going on too) are cheaper than the prices you would find on used copies at Gamestop.
I'll come up with something better eventually...
