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MattSteve - let's not go too far - there are laws against collusion; they may not apply here, but simply because a seller choses an open format to sell something doesn't give potential bidders carte blanche to act in any way they want just because we're in a free market society.
to wit: I believe (again, any legal experts should feel free to correct me) that if two potential bidders on a lot, who were both going to try and win it, compare notes beforehand, and decide that the one who was going to bid less drops out of the bidding altogether so as not to bid up the other party that is indeed illegal collusion.