When I sell a bass or effect, or amp, whatever...I never restrict my sales to "US only" or "Lower 48 only". If someone wants to buy from me and lives in a yurt on the Kazakh Steppes, fine by me! As long as they know about the shipping/customs price, I have no problem slapping a customs form on the side of the box. To date, I have sold a bass to a cat in Australia, before that, a set of SD QP
Js to a cat in Finland. Never a problem. Of course, that's just me...but I think a World Market Place would be a capital idea! That way, guys who only want to sell in the US can have their space, and the rest of the world can have a place they can go to strike a deal without having it nixed by a PM saying "Sorry, didn't realize you were in *insert country here*. I only sell in the US".