Sports Bettingʼs Rise and the Line Between Entertainment and Problem Gambling

Stanford University

Matthew Brown

Research

8 Pages

Stanford Initiative for Financial Decision Making examines whether sports betting is entertainment or behavioral bias, using data from 444 high volume bettors. Bettors expected to break even but lost 7.5 cents per dollar wagered, while 20% said they bet too much, highlighting overoptimism and self control problems.

Key Takeaways

Bettors misjudge losses: Bettors expected to break even but actually lost 7.5 cents per dollar wagered, showing a sizable gap between perceived skill and realized outcomes.
Parlays favor sportsbooks: Parlays generated 60% to 75% of sportsbook revenue in some states despite representing only 25% to 35% of money wagered.
Self control matters: Twenty percent of participants said they bet too much, yet the average bettor valued reducing future wagering at only 0.7 cents per dollar.
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