All it took for Bill Gates to become the richest man in the world was a little software: DOS, Windows, and some Office tools riding the wave of the PC revolution. I don't think Warren Buffett ever engineered or created anything, and he got to the top of the rich guy list. Imagine the wealth potential of someone simultaneously conquering space, ground transportation, and solving the problem of no electricity in places far away from power generation stations. Trifecta! Hat Trick Extraordinaire!
This 18 minute video is well worth your time to see the future this man is creating for all of us. I hope all the power (pun intended) doesn't change him for the worse. So far I like what I see, and I'm glad Elon decided to immigrate to the USA to make his fortune. We are still the land of opportunity.