If SpaceX is able to eventually deliver starship and take people to Mars, Musk will quickly become a multi trillionaire. The riches of space are out there for anyone with the technology and will to take it, we have plenty of people with the will but only one company that is getting closer on the tech front. There is quadrillions in wealth on other worlds and asteroids (obviously bringing a trillion of gold to earth severely reduces the price of gold, I mean economic opportunities).