It really is interesting, the internet can unite us in so many ways, but when it comes to buying and selling there are roadblocks. On a personal note, I retail auto parts around the world, and we found out that we are not protected with International CC's. Meaning that if we accept one and the customer disputes for ANY reason we are left holding the bag because most cc processors cannot verify international addresses. We got burned bad this way, product delivered, but customer claimed it wasn't - it was clearly fraud on his part but the bank didn't care.
I think this may be one reason that it is hard to accept intl cc's, there are bad apples out there who spoil it for everybody.