I've sold to and bought items from overseas. Haven't had a problem, certainly not on here and the large format photography forum. The people I buy from tend to have a significant number of posts as do the people I sell to. It's not quite as straightforward as buying/selling locally but often there isn't the option to do so, particularly down here in Australia. I've got good references from the various forums for buying and selling so if I see a "US only" for an item I'm really interested in, I'll ask politely if they'll make an exception and on occasions, sellers have done.