If they have it priced at $100 it's not worth bringing up. That's really what they want for it, maybe to them it's worth it, so slim chance they'll take half. Same thing at a game store, or anywhere where the prices seem really high, I wouldn't bother. I once had some crazy reseller try to tell me that Legend of Kage was the first game ever made on the NES. If that's what they think, I'm not going to argue with it. Usually just walk away if they clearly have no idea what they're peddling. Although, back in the time before time, that used to work to your advantage. People would sell you a game for $1 because it's old. Not anymore, now there's always a reason why it is has value, even if they're not sure what that reason is.