What is a profit boost promotion?

A profit boost (or odds boost) increases your payout on a specific bet or parlay by a set percentage. A "50% profit boost on any NFL parlay" turns a +300 parlay into +450. Boosts are often capped (e.g., max winnings of $250) and are single-use. They can represent real value when applied to bets you would place anyway, effectively reducing the vig you pay.