It fascinates me how casinos manage to function within such a dense web of rules and guidelines imposed by authorities. Making a profit is important, but so is preventing customers from breaking the law. Casinos use a variety of measures, including random Know Your Customer checks, to guarantee they are following the rules. Furthermore, the fact that only the biggest winners are subject to Know Your Customer checks is evidence of the system's fairness because it limits the opportunity for abuse of privilege. Responsible gambling, within one's financial means, is the best guarantee of a good time at the casino.