I can definitely see that as a possibility. There are two goodwills close to me... one is always good for scoring games(I just today scored a bunch of snes games: mario kart, yoshii's island/cookie, DKC etc. for $3 a piece), and the other is basically barren of games. I always figured they put their games on that auction site, but there is this one guy always posting games for sale on craigslist who lives not even a mile from that goodwill. I've bought stuff from him a couple of times, and while he could just hoard all the games from there since he lives so close I'm more inclined to believe he's an employee that cherry picks the goodies. For one, basically ALL of the games he sold had GW stickers, and just talking with him gave me the impression that he really did not know much about gaming. He's sold many copies of the same games too so it's hard to believe he's just some guy getting rid of the junk from his basement.
Anyways, it probably should bother me, but I dunno I just don't really care. The other GW still has good deals, plus I kinda feel like the employees deserve that incentive if they're inclined to act on it. Just like any good deal you gotta work to earn it, it's not much different from the lengths us CAGs go to get the jump on a deal if you ask me.