The question asked of Mark Cuban boiled down to: I want to be in X. It is my dream. Should I follow my dream?
Never follow your dreams. Follow your effort. It’s not about what you can dream of. That’s easy. It’s about whether or not it’s important enough to you to do the work to be ready to be successful in that business. "Never follow Your Dreams": Mark Cuban answers your question, Freakonomics 3 February 2011