Dude, your talking oxymorons. Look the forbes list is NOT some financial breakdown of the rap industry. Its a fluff piece put together yearly, its not serious financial journalism. Its not researched. You get on the forbes list by either being popular, being high ranking in previous years, or having your publicist contact them to pitch you being included by presenting your alleged income.
I have no clue what Wale or Fab makes, I am not arguing for either of them. I am just making it clear, forbes richest rappers list is not a reliable source of anything financial. If Ski Lo made 10 million last year off of the stock market investments he isnt going to show up on the forbes list or richest rappers. Its not even a BALLPARK its just an entertainment puff piece.