I think it is just crappy to buy a extra copy of a new game in short supply just to resell it. It's a real slap in the face to anyone who just wants to play the game that you force them to pay extra. Now if you find a copy of Mario Kart 64 at a tag sale for $2 and sell it for $30, that's ok, but to walk into a store and buy 20 copies of the hottest new game and go home and mark them up $30 is just shitty.
But with buying things on Amazon and reselling them, how do you do that without gouging the price? Things over there tend to be market value, with the occasional odd one out. With that said, I remember someone on here ranting on a copy of Zelda Collection for GC he sold. He marked it down to be nice, so someone can enjoy it, and got pissed when he saw the same copy resold for more.
Also what happened with NI NU Kun?