Ornery, I'm not saying that Buy.com doesn't usually have the lowest prices across the board. In fact, I think it does.
But usually when I buy an item, I don't need it right away and I have time to peruse all the "Hot Deal" forums and sites to get what I want as cheaply as possible. Granted, it would be more convenient to say "well, Buy.com will have a fair price, I'll just pay it every time", and not have to wait for rebates and whatnot, but I'm too cheap for that. When I can get the exact same item cheaper if I can wait and look around, I'll do it.