Another reason why I mentioned Greg is because Greg sells "tickets" to the state of California. The more schools he owns, the more tickets he can sell. His teachers sell their labor. They can only sell one ticket: themselves. My point is that people who sell many tickets (a product or service) make more money than people who only sell one ticket (their labor). In the movie industry, a movie star who can sell the most movie tickets makes the most money. The same is true for music stars. Musicians who sell the most derivatives (CDs, tickets, or downloads) make the most money. In sports, the promoters of the Super Bowl or Wimbledon make a lot of money because they can sell many tickets and media rights. In simple terms, if you can't sell "tickets" (derivatives of you), you have to sell your labor. I sell millions of "tickets" in the form of books, games, and special events, which are derivatives of me. My ability' to sell "tickets" is one reason why I prosper even during this financial crisis.
— Robert Kiyosaki; Rich Dad's Conspiracy of The Rich