If the sticker is new, it's easy to remove them by pealing them off. Older stickers require some kind of solvent like nail polish remover. You know what's fun? Pulling the sticker off of a used game (and sometimes, a new game) and seeing how (for example) it started off at $59.00. Then, it drops to $39.00. Then, it dips down to $17.99. And finally, the weekend of a big "Extra 20% off" sale or something, the price went back up to $19.99 or $21.99!!
But that's business. I worked in a shoe store that did the same thing.
Also, I went to Gamestop today and bought Assassin's Creed 2. The clerk was like "Did you find everything you're looking for?" Who the hell does he think he is, implying that I can't find everything I'm looking for!? Screw those guys!!