As I wrote, I now understand, what "shipping costs" means: a pledge to secure worldwide shipping. As others, I see no reason, why people in the usa should not make a pledge for that.
But the situation may change in the future. As everything is (will be) free in the board, the laptop and the pc, there in no reason, why the boards and everything else are in the future not build in another countries, for example in germany. Then there would be much smaller shipping costs. So help to get the project of the ground.
Wolfgang