If you bid on a car and it meets their reserve and you win the auction and then the seller says he has a friend who is going to pay a bit more money that the auction, would you tell him ....

a. to read ebay rules and go through with the deal

or

b. to piss off and go and waste someone elses time as out of priniciple you no longer want it

Just wondered as I'm tempted to tell him to feck off but dont want to have any neg feedback through him changing his mind ....

What would you do?