I had a repeat customer contact me yesterday to say she was trying to reorder and the system was telling her she can't buy from me because I don't ship to her location.  I checked the listing and there was nothing wrong there that I could see, so I added her to my block exceptoin list and asked her to try again.  She managed to buy the second time, but it makes you wonder how many others might have got that message and just given up and gone elsewhere?