It's all about the perceived value of the game. RE4 is much newer, and is worth more than DC2 to many people. Considering the TRU sale, it's possible to find traders willing to swap a $10 game for any other $10 game. Just like I'm looking for a sealed copy of Fatal Frame 2 (PS2) which, if found, is $10 at TRU from the GT sale. However, it's hard to find and believed to be more valuable, so I doubt I could swap a new DC2 for it. Good luck on your search though.