Steve,
In your hypothetical situation you are only making 15% on your investment. There are times when you could have made more money on some cards and less money on other cards. That would mean that you may have made only 8% -10% on some cards and perhaps you made 23%-25% on other cards. In that scenario it'd be pretty ballsy to try and make 20 bucks off a $250 dollar purchase. My idea of buying cards under market is probably a bit different. Hey at least you're not too greedy....
Just funnin around with your hypothetical, that's all....
