In Everquest (no flames please, I don't play it anymore), they had a barter option where you could put up a list of things you wanted to buy, and the price you were willing to pay for them, like a reverse auction house. Players would submit the item to the character (or in this case, an Auction House type person) and immediately receive their payment.
I think this would be an excellent addition to DDO and would help level out the exorbiant pricing in the Auction House these days.
What do you all think? Pros/Cons?