I'm standing in line at an estate sale that has NES stuff. I got here 45 mins before the sale is supposed to start, and there are still 2 guys in front of me talking about the best way to flip games online for a profit. I'm not even sure why I'm still here, honestly.
Do they look tough or do they look like wimps? If they look tough, I say try to outsmart them in some way. If they look like wimps, shove them out of the way and say, "You two are not gamers! Shame on you! Bad dogs!"
Seriously, though. People like that drive me nuts. My guess is that they have no job and they get off on duping gamers that would happily buy and enjoy the game instead of flipping them.