By regulation, a Nevada casino must have a theoretical payout of at least 75%-meaning for every $1 wagered, a player can expect to make back at least 75 cents on average-but the average rate is closer to the low 90% range. While slots have some of the best odds in a casino, sharp gamblers understand that the pay rate for them means very little. Harry Benson/Daily Express/Hulton Archive/Getty Images And the Beatles could afford to lose a few pounds. All You Need Is Luck: Slots are now designed to be far more addictive than when the Beatles took one for a spin in 1964.