I note customary play does matter in casino affairs. Each casino has its own set of rules and procedures for how games are played, how bets are placed, and how payouts are made. These rules are typically based on what is customary or standard practice in the casino industry.For example, in most casinos, the dealer is required to draw to a certain point in games like blackjack, and players must follow a set of predetermined rules when playing craps. These rules ensure that all players have a fair and equal chance of winning.