Founders liquid money

Recently after seeing Shark Tank India episodes, a question came to mind. How do these sharks without taking a high compensation or without being a listed company, have so much money to spend? Like for example Aman or Vineeta or the Veeba founder, these guys aren't running very profitable businesses, aren't taking high salaries and it's not like they can't borrow on their shares because it's not listed. But they still have big houses and lots of money to invest in startups. How?