[Fred]

I would think that most people would not consider discounting a card just because they attained it at a much lower price. If a card was purchased at a much lower price, then the seller has to negotiate in the sale of the card.

If the buyer is a known flipper, then I'd make sure they got the good guy discount of about 0% because if they're willing to pay full bore on a card, then they're probably looking to flip it for more.

Perhaps one reason to discount the card would be to help out a fellow collector that could really use the card. But it would be disappointing to see that fellow collector sell the card shortly after claiming they wanted it for their collection.