Ok, I totally agree with nat.
Michelle, I don't think there's anything wrong with buying to resell. Just as it's not wrong to snag the jeans your friend has been wanting, as everything is first come first serve/finders keepers losers weepers (i know...junior high school saying), i think it's a bit inconsiderate and uncourteous to your fellow HFers. it's just not the spirit or culture of this forum. As a member of this forum, I feel a comaradie/fellowship and hence loyalty to one another.
I think there's nothing technically wrong with your actions, but it might be perceived to some as socially distateful.