I sold FFX and FFX-2 back to gamestop for 5 bucks.

When I looked back in it in hindsight, I could have sold them to some fan for more, but oh well.

Really, it depends on what I'd need the money for. If I had to pay bills, I'd sell things worth the most that I care about the least to get money to cover things for a while. Now if it was for something I wanted to buy, I don't find any sense in selling things I currently have only to buy me something else I may end up selling back later.

Only games I would sell are my copies of FFVI. Everything else is free-game to the buying world