Mostly this problem is contained in the fact that the US makes it so difficult for Canadians to get green cards (you heard it here), but if an American orchestra really wants a player, they have their ways.
7th Heaven is quite a hit for them now, and they are hoping to appeal to a very similar audience with our show; skewed slightly older I guess, since it's a 9:00 to 10:00 show.
The more you turn down things, the more difficult it becomes to feel that the next one will be right.