I think it goes back to Al Capone's tax trial with his estimated gross income of over $100 million. People are naturally curious and government officials want to know so they can go after their assets. I think when economist come up with those figures they include all the money that's not kicked up. They're not just trying to figure out how much the bosses get, but everyone involved. Total gross income figure for the entire organization. When your talking about gross numbers then it's easy to come up with figures in the billions.