You can't cancel bids after the auction has ended 
on Ebay.  That's been the case for quite awhile 
and like you've already said, Yann, you haven't 
used ebay in several years.  So, you're not an 
authority on this.  The bottom line (which you 
seem to be missing in this thread) is that it is 
the DESCRETION of the SELLER and not anyone else 
whether they accept international customers or 
not.  If an international bidder disregards this 
then they are not only VIOLATING the rules of 
auction service, they are also wasting the time 
and money of the seller.  This is totally wrong 
on their part.