Estimated world population as of Oct. 31, 2011 7 billion
Estimated population of the U.S. for 2012 313,281,000
Estimated number of U.S. citizens living abroad 6 million
Estimated costs to administer FATCA and chase those 6 million- billions of dollars forever. Net benefit to be derived at the best is most likely zero but is more than likely to be negative because the taxes collected are not likely to ever exceed the cost of FATCA compliance.