Ever go to a used game store, buy a great game in decent/good condition, then go home and tear off any stickers, and find a huge, blatant bruise on the game?
This happened to me with Zelda 2. Well, the game was already in C- condition, but when I took the price label off, there was just a huge spot of black on it, where something had destroyed the paint in that particular spot.
Redundant question though, since a sticker on the game lowers the value anyways.