If it wasted more time than the sale was worth, why did you refund the original payment? What is the fee anyways? I don't mind paying it as it's probably less than a dollar, but don't appreciate the attitude. And it's not buyer's fee, it's seller fee; so don't throw it at me as if your paying my fees.
First of all, I would argue that it is your liability and not mine as you have implied in your initial rude pm. It's called seller fees, as you probably have a business account and not a personal account. I sent you $13, how much are you expecting as the correct amount anyway out of curiosity? As I still have no idea.
You should let people know in future auctions along with the amount of fees you are expecting as there is no way of even knowing. I pay taxes, but I don't pay for the merchant's visa charges when I use my credit card unless it's specified.
Anyways, if you can figure out the fees. Send me a pm of the total amount with the fee, I'll pay your paypal seller fees. I just didn't appreciate the way you demanded it.