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Parlay bets are the combination of at least two wagers. A parlay wager might include a bet that a baseball team will win, the pitcher will record at least three strikeouts, and the catcher will hit a home run. The possibilities are endless, and the added bets don’t all have to come from the same game or even the same sport. The upside is that, with each additional component, the payout rate goes up. The downside is that parlays are all or nothing: If a single leg of the parlay misses, the whole bet loses, so adding more lines to the parlay drastically reduces the odds of winning. The result is pure excitement. “A parlay is sort of like poppers mixed with molly mixed with cocaine mixed with a heart condition,” journalist Anthony Schneck writes. The excitement factor is offset by the fact that parlays are simply a dumb way to bet for the vast majority of gamblers. Between 1989 and 2023, casinos kept roughly five cents for every dollar bet on non-parlay sports bets and thirty-one cents for every dollar bet on parlays; still, parlays are hugely popular among amateur bettors, especially in the United States. In the age of cryptocurrency and GameStop, these gamblers want to multiply their money many times over, and they want to do it quickly. So they turn to parlays, which represent the jackpotification of sports betting, the transformation of sports betting slips into lottery tickets.
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Jonathan D. Cohen (Losing Big: America's Reckless Bet on Sports Gambling)