Books on gambling theory should help you make money. His theories will not do that, since they lack a solid mathematical basis. Take a look at his book on Craps, or "Beating Roulette!" (I mention this, as professional gamblers do not try to beat Roulette with any system you can find in a book).Everything he puts out in any gambling topic is "fast food". His goal is to sell books, not to educate. If you are serious about studying sports investing, a good introductory text is "Sharp Sports Betting" by Stanford Wong (who is also a legitimate Blackjack author).