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MattPaul - this discussion is really off-topic, but which of the following are you claiming:
(for our purposes, I'm using "established market value" to mean the price an identical item has sold for on multiple occasions)
1) An item sold on open auction will always realize its established market value (barring an act of God as you say).
2) By definition, an item sold on open auction is worth whatever it ends as.
If you are only stating #2, I don't see how that is relevant to a discussion of a seller taking an offer to end the listing early; after all, if the established market value is more then the item will end up at it, he would be making a wise decision in taking the offer at the established market value. Of course this is a gamble, but it's not always a bad move by the seller as you suggest.
If you are claiming #1 then I debate that since I often see ebay listings end for less then established market value.