I see nothing wrong with someone contacting a losing bidder and offering a chip at either the winning bid price, or any other price(higher or lower). I don't believe the listing seller on a single chip has any "rights" to the losing bidders' business. It seems to me, that when a seller has 3 of the same chip for sale, and choses to list them one at a time, rather than say, in a dutch auction, he knows full well that part of the reason for doing so is to make his chip more attractive to the bidders; if they think this is their only chance to bid on this chip, that will naturally drive the price higher than if the top 3 bidders knew there were three chips for sale. So to me it seems like the seller makes a choice: if you want top dollar for a single chip, list it as if you only have one for sale and see what the bidding does to drive up the price. This is fine(and in fact is the point of auctions vs just putting a classified for sale ad on the board with a set price); but when you make that choice, you certainly(IMO) don't retain any "rights to the losing bidders. And it sure doesn't seem to me that a seller should have the expectation that a price determined by buyers under the impression there is only one available should then be used as some sort of legitimate "market value" for other identical chips. You can't have your bidding war and sales volume too! (disclaimer: the above opinion is from someone who has never sold a chip in his life, and has purchased mass quantities--OK, 5 total--chips from EBAY. But I would actually have appreciated someone contacting me on a losing bid, because I wanted the chip bad or I wouldn't have bid in the first place!)