@rbreich the common element here is, there are a very small number of people who actually created a billion dollars' worth of value, and most of those (Telsa for example) didn't get to keep it.

Ford and Edison did but both were ruthless SOBs. A nice humane inventor will not get to keep the money.

The main way to obtain for yourself the lifetime productive output of a few hundred people is by force or fraud.

As for Musk, reusable rockets are the most important thing he has made real.