Polymarket and Kalshi have become the latest arenas for those hoping to turn a quick profit, but a Wall Street Journal analysis shows that only a handful of traders consistently win. Most participants, including everyday users, lose money as the markets shift focus from sports to celebrity predictions and other high‑risk bets.

John Pederson, a 33‑year‑old former line cook, used a loan to trade on Kalshi’s platform. He amplified an initial $2,000 into almost $8,000 by betting on Detroit snowfall totals, then grew that into $41,000 through sports‑related trades that leveraged AI‑driven strategies.

Despite the short‑term gains, Pederson’s final bet—a wager that a celebrity would say a specific word on television—cost him everything. His loss mirrors a broader trend: most accounts on Polymarket and Kalshi exit with negative balances, as the odds favor complex, low‑probability events that few can predict reliably.

The data suggest that prediction markets act more as speculative playgrounds than reliable investment vehicles. For regulators and platform developers, the challenge lies in balancing user appeal with transparent risk disclosures, lest the allure of quick gains drive more participants into substantial financial loss.