First, It's not like I would have bought ten copies. I would have bought 2. TWO! And second, if I can get an extra ten bucks on trade in value, and combine it with a deal like the extra ten on trade ins that EB ran, (I dunno if that's still running) we're talking about getting double your value back.
You guys are just bitter because you missed out. There is nothing out of line with buying two copies of a game. If it was six or eight I might be there with you but two is not a problem.
I remember the CC Clone/Wars Tetris Deal. There were ten copies at CC. I bought three. Two for myself and one for a friend. When I went back a week later there were still five copies left. I bought two more, and left three for other people. That's not being piggish, that's giving others a shot while getting in on a good deal.