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boxingcardmanit is their card and they can offer it for whatever they want.
I really do not buy the whole "he paid this so sell it to me for this plus a buck" line of reasoning. I mean, if I found a 1933 Goudey Ruth for ten bucks, by that logic I am doomed to sell it for $11. I buy stuff all the time that I think is vastly undervalued. If a buyer comes along and offers me what I paid plus a little but I still think the card is undervalued, my answer is "no". If the offeror is rude (I've actually gotten offers that go something like "I know you paid X for this card so where do you get the nerve offering it for Y; I'll pay you Z") I admit that I ignore it.
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