Chester Carlson made millions in Xerox. But not necessarily with your favourite invention.
Invention is the discovery of a new way to solve a problem.
Often this discovery is an exciting experience. But there is a vast difference between solving a problem that is personally significant to you, and inventing something that will make money. You may have figured out how to keep your clothes line from sagging. But this is not a problem for which millions would pay to have access to your solution. There are countless bathroom-related inventions.