I don't want to quote "Americans being self-serving"...but as someone coming from overseas, I really do question the idea of a lottery that's only open to...funnily enough, the country hosting the con.
What would make it much better is if you could register a US Member ID for the lottery, THEN, if picked, you could enter WHATEVER member ID's you wanted. E.g, one of yours, or 2 of someone else