I would Sell them to friends you have that "really" want one of your games. Not charity by any means, but it makes you feel good helping get the right game to the right person who will appreciate it like you did. You can also visit friends and play the game again.
Any "mistakes" in selling can be corrected in the future by buying the game back. If you sell it to a friend you kind of have a line on it for the futrue to buy it back. Good luck.