I'm not quite sure what you're getting at, here. The prices on average should be that we sell slightly above market price and buy slightly below it. Because we can more efficiently trade than a manual trader, we can cut down those margins and rely upon volume of sales rather than a few small, high-profit sales. Scrap.tf exists to give users a quick service with easy access to the items they want, at a slight premium. that slight premium is where we make the profit. For items that people don't want to buy form us much but want to sell to us a lot, we'll pay very little, and for items users don't want to sell to us much but want to buy quickly, we'll ask them to pay a larger premium. This all ensures that a consistent margin is kept, helping us stay in business and ensuring we don't become flooded with things nobody wants or always out of things everybody wants.