I think that it depends on who the buyer is. Earlier in this thread there was nice story about a candy shop owner and a child. In that case, you would be a complete scum to take advantage of someone who doesn't know about value and also doesn't have the resources to establish value.
If I was approached by an adult with the card in this thread, I would ask what they want for it? I don't think that the dealer has an obligation to educate the person selling the card on the value. It is the seller of the cards obligation to establish the value of the card on their own. If he asked me what it is worth, that is a different story. To low ball him at that point would be a dishonest thing to do.
I once sold a Brooklyn Dodgers item to a dealer at a show. I showed the piece to him and he offered me $500. I was thrilled to get that amount. I watched him later sell it for $1,000. I was happy for both of us. Should I have expected him to offer me the $1,000 in the first place?
Jeff
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