Let us use high temperature superconductor as an example. Dr. Chu discovered HTS material back in the 80s, and now at least 100 companies or universities are repeating and advancing his work without his help. The amount of real-life applications is still limited, but if Dr. Chu sells stocks, I will buy some anytime.
Also being rich is not the number one dream of most researchers. Our number one goal is getting Nobel Prize, and number two goal is to be a professor at MIT or Caltech.