I was born and worked in the U.S. most of my life. I chose to retire to the Philippines. I have maintaned a U.S. billing address for 7 years because i took my credit cards with me. I think it is pretty normal for retirees or even internet marketers who like to bum around the world with their notebook. 100,000 thousand Americans live here, some of them with millions of dollars. You don't want their business? Maybe you would like to stop selling digital products because sometimes they get posted on warez websites?