1. The Hassle: A lot of people don't want to fill out a simple customs form and make an invoice. They COULD print one off in five minutes from any one of 500,000 free templates on the net but they don't want to.
2. The Risk: If there is anything that the buyer doesn't like, or something goes missing, or whatever then The Hassle goes up even more. To ship it BACK to the US involves more customs forms, the buyer has to deal with whatever he paid in import taxes if any....
All that said I ship to every country on the planet and have done so for all of my 20 years. My friend Roy Malott at
www.indyq.com ships to every country all over the world.
So there are plenty of sellers who don't have any problem shipping internationally.