I haven't ever bought used from the site but I've bought plenty of times in store and the discs are always in perfect condition. Also, it seems the stickers are on the shrinkwrap, I don't recall them being on the boxes.
The company is trying to phase out DVD's all together. The GameStop I work at is one of the smaller ones in the company so we have the buy 2 get 2 free sale. We don't do DVD trades at all, for cash or credit. 5 minutes down the road are a couple more that are a bit bigger and they're doing...