I sold my Gamecube as well as a bunch of games a couple years ago. Figured I should sell it while it was still worth something. I kept the few games I just had to keep however, which was Luigi's Mansion, Super Mario Sunshine and Resident Evil Zero. I sold around 10 games, and I don't miss any of them, so it was a good call I suppose.

I really can't sell any games that are even kinda fun. I get urges to play games I don't have. I can only sell boring games.