We study the gambling behavior of 1,046 sports bettors on a Brazilian betting platform using real transaction data collected via web-scraping. Unlike most prior work, which relies on laboratory experiments, our dataset captures revealed preferences through actual wagers, odds, and outcomes. We document that the typical bettor places small wagers at high odds and incurs a median return of $-72.35\%$. Fewer than 7.5\% of bettors realize a positive profit, and no individual earns monthly profits exceeding the minimum wage. So, no individual is taxed. Half of new bettors are no longer observed in the platform after 34 bets, yet cumulative losses continue to deepen for those who persist. Back-of-the-envelope calculations suggest that the firm generates approximately R\$0.3 million in monthly taxes. These findings highlight the prevalence of sustained losses among bettors and provide policymakers with evidence on the behavioral dimension of users in the rapidly expanding sports betting market.
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