How Sportsbooks Try to Beat You (and How to Beat Them Back)

Ever wondered how sportsbooks make money - no matter who wins the game? It all comes down to margin (also called “hold” or “vig”). Here’s how it works:

• When you look at odds, they’re tilted ever so slightly in the book’s favor.

• That small margin means the average bettor will always lose long-term, even if they win here and there.

• For the sportsbook, it’s like running a casino slot machine—mathematically rigged to profit over time.

But here’s the secret: arbitrage neutralizes the margin.

Instead of being trapped by the vig, arbing lets you take odds from multiple sportsbooks and lock in guaranteed profit - no matter who wins. You’re essentially flipping the table and using their system against them.

That’s why we built Spro: real-time, lightning-fast odd updates that help you find these guaranteed profit plays so you can finally beat the books.