Many of these famous persons made other persons rich and wealthy during their times, like I think MJ did and am sure that goes to all our current famous persons who go out of their way to help as much persons along the way while receiving royalties and topped up with a great contract of percentage.

When people get famous and attain a level of wealth, it is always wise to be more careful which contracts to endorse, how much money is spent and invested and how not to be too generous.

Also, I think famous persons like the king of pop or other breakthrough famous persons in their fields, become famous by being excellent in their area of pursuit and made significant impact that generations will have to study their theories and analyze their abilities just to understand that fulfillment in life doesn't come from having so much money but in making a reasonable contribution to this world during your time here that others do not forget the legacy for eternity.