This is all really bothering. Its called a mistake...NOW if the seller is a DEALER and by that I mean is set up in business with the purpose of buying and selling advertising items for a profit, and made that mistake...Then shame on him and he needs to honor that deal. IF he is Joe the Plumber and found a sign and thought he was hitting a home run and then learned he just lost the world series and wanted to do better for his family...then really WHO CARES. If he returned the money SPEEDY and it was not a big issue, then "wow that sucks" is about all that is in order. Maybe he should send an Applebee's giftcard or something but JEEZ people do you really need something for a steal so bad that you will threaten this guy and want bad things to happen to him. I think that all the hate that is thrown around on this should be backed down a bit...NOW for the guy who offered more AFTER a sale...that is just not how it works and should learn some etiquette.