While the seller may have changed his mind on the price he was asking, I think the potential buyer, rather than taking advantage of the seller's lack of knowledge, could have said, "hey, that's worth a lot more than $250. How about if I give you $750." I think as collectors, we should be fair with others, and not try to take advantage of them because they lack the knowledge to properly price stuff.
The posting of the flame CL add, because the seller changed his mind when he discovered its value, was inappropriate in my view.
I say, take the high road.
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