In all my time on eBid I have probably had 3 buyers not pay for an item they hit buy now on. They have ignored payment reminders etc. so I have no issue with leaving neutral feedback stating something like "buyer failed to complete transaction, failed to respond to payment reminders and other attempts to communicate with buyer". The times I have had to do this it has been a new buyer who has signed up to eBid to specifically purchase from my store and then not bothered completing the transaction after "purchasing" the item. However, I think you should be able to get the fee refunded or have the fee cancelled out before you pay it without all the jumping through hoops from the moment you mark a buyer as non-paying etc.