Peter, I don't think so. Nor is that scenario likely to occur. While the buyer received what could be perceived as a windfall, you aren't out anything and haven't suffered a loss, except, perhaps, a loss of opportunity.
egbeachley, as for paying 8 money for a 6 and "looking at the card" you are missing the point. You paid 8 money for an 8 card that became a 6card. "Looking at the card" isn't going to help because it only became a 6 due to a change in grading standards. Unless you are the Amazing Karnak and can anticipate that change, you can look at the card until your eyes fall out and it won't matter.
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