After just a few short hours of having signed up for Gamespot's GameMarket, 3 of the 7 games posted have sold. Collectively I am to receive $56.31 for the games opposed to the amazon trade-in value of $51.20, so as you can see there isn't a whole lot of difference in price if you follow the market instead of pricing more closely to the pre-owned price of other used dealers.

I sold my games for much cheaper than what Gamestop is asking for pre-owned copies, yet I'm making more money than had I traded it in. And therein lies the beauty. Gives great deals, get great deals. I sell for less, you sell for less, and we're all happy :)