If sports prediction markets had been around back then, the notorious sports bettor and convicted insider trader says he’d be worth billions. Sports bettor Billy Walters, seen here during his federal insider trading trial in 2017, says he could have made billions of dollars using prediction markets. Patrick Everson of Vegas Insider was first to report on Walters’ prediction markets comment. Quote of the Day at @bet_bash, from legendary sports bettor Billy Walters:“If prediction markets existed 25 years ago, then I’d be worth a hundred billion dollars.” Because prediction markets operate as peer-to-peer exchanges, rather than pitting bettors against the house, traders are less likely to face limits.