Sports betting parlays are delivering 56% of sportsbook revenue while destroying families

Summary

Sports Betting Parlays Are Reshaping the Economics of Gambling—and Destroying Families

Parlays—multileg sports bets combining multiple predictions into a single wager with tantalizing odds—have become the profit engine of American sportsbooks while creating a class of customers whose losses bankroll the industry.

The scale is stark. Parlays accounted for just 27% of money wagered across sports betting in Illinois, New Jersey, and Colorado through October 2024, yet delivered 56% of total sportsbook revenue. That concentration has made the product so valuable that Flutter Entertainment, parent of FanDuel, raised its forecast for U.S. online gambling revenue to $63 billion by 2030, up from $40 billion just two years earlier. The revision hinges almost entirely on parlay growth.

The mechanics explain why. A typical parlay requires every prediction to hit. The Wall Street Journal placed 209 bets on parlays promoted by DraftKings and FanDuel and won only 8—an 8/209 success rate. The sportsbooks retained $113.21 of every $100 wagered. Single bets by comparison give the house a much smaller edge; the odds of hitting consecutive legs collapse the probability so steeply that customers have almost no shot, yet the payout if they do—often $20,000 or more on a $5 wager—feels achievable. The math is intentionally opaque. Calculating the true odds for same-game parlays requires modeling conditional probabilities: how a quarterback's performance affects wide receiver production, how one outcome cascades into another. DraftKings and FanDuel don't just offer bettors individual wagers to combine themselves; they pre-package branded parlays with names like "Merry Chiefsmas" (7.7% win probability, $13 on $1) and "Believe Land," outsourcing the parlay construction to their marketing and odds teams.

The product originated in Australia. Flutter's Sportsbet brand there launched multis—multileg bets on separate sporting events. When a customer asked why he couldn't place a multi on a single game, Sportsbet engineered the math. Sportsbet launched single-game parlays in 2016. FanDuel imported the product to the U.S. in 2019 as the "single game parlay," and it went viral. The same-game format has since spread across the global sports betting industry.

Advertising fuels the addiction cycle. DraftKings and FanDuel control roughly 80% of the U.S. sports betting market. They've enlisted celebrities including Charles Barkley and Kevin Hart and armies of smaller influencers to assemble eye-catching parlays. Sportsbooks also deploy a luxury-brand distribution model: assigned VIP hosts text customers daily with pre-built parlay suggestions and new product offers, mimicking the personal-shopper experience of high-end retail.

The consequences are severe and deliberate. One lawsuit documents a man who had never placed a single sports bet before 2020. By 2024, he had gambled away $1 million of his family's money, including his children's Christmas gifts and baptism money, his wife's bank accounts, and her credit cards. Throughout, DraftKings assigned him a dedicated VIP host who spoke to him daily and "facilitated his access to more gambling products while knowing his family status."

The same-game parlay structure also creates a secondary harm: intense social media harassment of athletes when bets fail. If a player misses a statistical target—say, a wide receiver needing 70 yards gets only 17—thousands of bettors lose simultaneously. Comments sections on fighters' and tennis players' Instagram accounts fill with abuse. One fighter had to disable comments entirely because fans called him an idiot for costing them $50,000 on a single parlay. Athletes face immense pressure to hit arbitrary statistical thresholds they didn't agree to and have no control over.

The regulatory picture tilted toward sportsbooks when the Supreme Court returned sports betting authority to states in 2018. States have legalized it piecemeal, partly on the theory that gambling is already happening via Venmo and Zelle—better to tax it than let bookies pocket the money. But legalization has expanded the market beyond what the gray market ever achieved. Parlays barely existed as a mass-market product until DraftKings and FanDuel promoted them; now they're the margin driver.

The structural winner-selection mechanism makes clear who the business depends on. Customers who develop an edge get banned. If your DraftKings account still works after a month, the sportsbooks are confident you're a net loser. This isn't a market that rewards skill or information; it's engineered to extract money from the statistically illiterate and psychologically vulnerable. The companies pay a VIP host salary out of incremental revenue from a single whale customer. One $1 million loser can fund full-time personalized attention.

Unlike stock trading or crypto—where retail participation at least touches real assets and markets with long-term positive-sum characteristics—sports betting is zero-sum and designed to feel like a lottery. A dollar-cost averager in the S&P 500 ends up wealthy. A person spending $10 daily on parlays ends up broken.