I used to, until I realized years ago that you get ripped off from game stores. Unless you sell them on Ebay/Craigslist it just isnt worth it IMO.
Last straw was when I tried to return an unopened copy of Fable 2 (without the receipt) that I got from a friend for Christmas. I tried to return it to Gamestop, because I got the collectors edition from my Wife for Christmas and now had 2 unopened copies.
They tried to give me the used price for an unopened copy.......unopened. I about punched the clerk in the face.