I recentaly beat story mode on legend of zelda twilight princess but I do not know if I want to sell it. It was a very good game but all that is left for me to do is some sidequests.
Most games don't have re playability. If you've lost interest in the game, sell it! But if you think you'll want to play it again further down the road, hang on to it.
http://funadvice.com/r/bqelrjg3oal buys Wii, Xbox 360 and PS3 games if you have those lying around.