Basically no sport that isn't nationally televised on a regular schedule is making the participants rich.
Even the ones that are, only the very, very tip top are doing really well.
Golf and tennis even, you have to be in the top couple hundred in the world to make a living. To break $100k in earnings means top 100 for golf basically, and tons of travel. They're working constantly.
Tennis is slightly easier, top 200 are all over $300k for the year, on the men's side.