Importantly, consequential sports bettors apply these principles to their craft with equal alacrity. One particular pro gambler highlighted in GTG made an incredible living just by arbitraging, particularly before the advent of the internet (which made real-time odds from multiple sportsbooks widely available, thus negating the benefit certain pro gamblers had who maintained a network of sportsbooks and bookies constantly providing real-time odds changes over the phone).* As one web site explains re: arbitrage in sports betting, "An arbitrage is available when pricing discrepancies between betting sites allow [bettors] to place bets that will yield a guaranteed risk-free profit." Though there are several forms arbitrage can take, the most common among the pro gamblers I interviewed is often referred to simply as "One Good, Two Markets" and is summed up as follows:
- Place a $300 bet on the Red Sox with Billy at even odds.
- Place a $200 bet on the White Sox with Steve at +200.