Don Johnson is a legendary high-stakes gambler who famously beat several Atlantic City casinos for over $15 million in blackjack winnings — all in just a few months. What made Johnson’s success so remarkable was that he did not rely on card counting or traditional advantage play. Instead, he negotiated special rules and conditions with casinos during a promotional slump, securing player-friendly terms such as loss rebates, better deck penetration, and high betting limits. Using his experience in horse racing and mathematical modeling, Johnson carefully exploited these opportunities with disciplined bankroll management. His story is a testament to the power of negotiation, preparation, and psychological composure under pressure. Today, Johnson is considered a master of leveraging the business side of gambling to create profitable opportunities where none seem to exist.