What, in your opinion, is the buyer supposed to do?
There isn't a mechanism for alerting the seller to a potential listing / pricing error.
There isn't a mechanism for determining who you purchased a card from if you didn't make an offer.
If you did make an offer, there isn't a mechanism for finding a particular offer among all the thousands of offers you have ever made or received.
There isn't a mechanism for contacting a seller and asking if they want their card back.
There isn't a mechanism for allowing a particular seller to repurchase their card.
And how would the buyer know that the seller does want the card back? Lots of sellers would price a $60 BV card at $10 right off the bat. Or they might price it at $20 and advertise that they accept 50% offers. How are they to know that this was even an error?
COMC: Thousands of prices have recently been slashed! Auto accept is currently at 35% off asking price for a limited time.