This bet comes with a 5% commission, payable to the casino, which grants the player the true odds on their wager. When a player buys a number in craps, they are essentially placing a bet on a specific point number (4, 5, 6, 8, 9, or 10) after the come-out roll. Buying a number is one of the more advanced betting strategies, allowing players to manipulate their odds and potentially enhance their chances of winning. Craps, a popular dice game played in casinos around the globe, offers players a myriad of betting options, each with its own set of rules and potential outcomes. What Does It Mean To Buy A Number In Craps: In the exhilarating world of craps, “buying a number” is a term that refers to a specific type of bet players can make during the course of the game.