Prop betting doesn't typically qualify as a profitable wager type for sportsbooks. Most betting operations offer wagers that guarantee that the sportsbook will earn money from the bettors. However, in the case of a prop bet, it’s not as easy to guarantee that the sportsbook will earn money, because they have less predictable outcomes. Due to the amount of effort required, and because specificity is advantageous for the bettor, it's not always profitable for sportsbooks.