I looked at your highest and lowest priced items, and both have USA accepted as a definition.
so how come he is getting this message
It's not you, it's him?
Do you have a Block on bidders with multiple deadbeat Strikes?
Do you have a Block on buyers without active Paypal accounts?
BTW- The Pressed Fairy Book is co-authored by Terry Jones of Monty Python fame. One of my favourites.