[swarmee]

Originally Posted by Peter_Spaeth

Eric in theory you are right, buyers cannot lawfully collude to suppress price any more than sellers can collude to inflate it. Basic antitrust law. Of course, as a practical matter, it's going to be viewed as less important than seller price-fixing.

And almost impossible to prove, since they're not going to discuss their lack of additional bids with anyone else, including the auctionhouse...