They probably ended the listing early and were making a deal off of Ebay and as a cash, check, or money order payment instead of using Paypal. The Paypal fees on a $15,000 sale would be $435 at 2.9%. If this is what they were doing, then add that to the $250 and they would have been trying to save a total of $685 on the sale, which depending on their actual profit margin might have been a big difference.