

Why almost everyone loses—except a few sharks—on prediction markets
Subscribe to enjoy similar stories.John Pederson, 33, couldn’t work. The former Outback Steakhouse line cook was recovering from a car crash and running out of money. Kalshi, the prediction market, promised a quick way to fix that.
He took out a variable-interest loan and started betting.At first, it worked. Pederson turned about $2,000 into close to $8,000 by betting on daily snowfall totals in Detroit, where he lives. He parlayed that into $41,000 by trading on sports, using a strategy he developed with the help of AI, according to a Wall Street Journal review of his account records.Then he placed his most audacious bet yet: All $41,000 that a celebrity would say a particular word on TV.
He lost it all.Pederson isn’t alone in walking away empty-handed from the bet-on-anything markets, which cover sports, celebrities, news and more.Kalshi and its competitor Polymarket advertise themselves as life-changing tools for regular people—implying everyone has a fair chance to score. “I was about to be unable to pay my rent, but I got two years of rent through Kalshi’s predictions,” gushed one woman in a Kalshi ad on TikTok.But for most users the reality is nothing like that.Instead, casual traders are bleeding cash while a small number of sophisticated pros—including trading firms with access to vast streams of data—eat their lunch, according to a Journal analysis of platform data and interviews with traders.On Polymarket, the Journal found, 67% of profits go to just 0.1% of accounts. That means less than 2,000 accounts netted a total of nearly half a billion dollars.
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