Definition
A soft book is a sportsbook that primarily caters to recreational bettors. They offer promotions and bonuses but have higher vig, lower limits, and will quickly limit or ban winning players. Most US legal sportsbooks are soft books.
Example
FanDuel offers a $1,000 risk-free bet promotion to attract new users. But after you win consistently for a few weeks, your max bet drops from $500 to $10 on NFL spreads. That's soft book behavior.
Common Questions
Why do soft books limit winners?
Why do soft books limit winners?
Their business model depends on recreational losers. Winning bettors hurt profitability. Unlike sharp books that welcome action, soft books protect margins by restricting anyone who shows betting skill.
How do I extend my soft book lifespan?
How do I extend my soft book lifespan?
Mix in losing bets on props and parlays, don't bet steam moves, vary bet timing, use promos, and don't max bet every +EV opportunity. Acting recreational helps, but eventually they'll catch on.