"His current net worth is around $9-12 million." You have no idea what his net worth is. Do you have access to banks in the Caymans, Belize, Uruguay, etc? Do you have a full catalogue of numbered corporations, trusts, partnerships and others? People at this level have wealth that is almost impossible to track. The only reason Bill Gates and the rest are the 'richest people in the world' is that their wealth is largely tied up in stocks, the value of which is public information.