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A customer might buy a team at 55 or 56 cents expecting the price to rise to 58 or 59 cents, he explains. If it falls to 45 cents instead, the trader may refuse to accept the loss and continue holding the position.
“People will lose money faster on exchanges for lots of reasons,” Marantelli says. “It inherently increases spend, volatility, lots of things. And you’re playing against a sharper audience than you’re playing against at the DraftKings sportsbook.”
He compares the effect with sportsbook cash-out features, which gave customers more apparent control over their bets but may also have encouraged greater spending. The crucial difference is that an exchange customer can be facing a specialist whose entire business is identifying inaccurately priced contracts.
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Another bettor noted that gambling debts fractured personal relationships: “Sports betting ruined my six years of friendship because I couldn’t pay back the borrowed loan from my friend. He stopped talking to me.”
Americans wagered nearly $167 billion on sports in 2025 through regulated sportsbooks, an 11% increase year-over-year, according to data from the American Gaming Association (AGA).
The blurring line between financial investing and gambling has been accelerated by the rise of prediction markets—exchanges offering event contracts that are federally regulated as financial derivatives. U.S. News found that over 40% of active sports bettors now also participate in sports prediction markets.
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Other studies have made similar estimations. In June last year two thirds of bettors surveyed by YouGov said the tax increase, which will also hit online sports betting from next year, would drive them to play with unlicensed operators.
The UK has historically maintained a high channelisation rate due to it being particuarly mature with a huge competitive offering. According to the report, up to 1,491 licensed sites provides sufficient choice for engaged players.
The report utilised various methods to estimate the size and scale of Europe’s black market, including web traffic, digital marketing, macros data and regulations in place across the 28 markets surveyed.
