Not all sportsbooks run the same business. The difference isn't in the website or the promotions — it's in how they make money.
The retail model
Most sportsbooks profit from margins and bet distribution. They work with wide margins, offer generous promotions, and rely on the fact that most customers lose over time.
Predictable consequence: anyone who wins consistently gets limited or closed. It's not a system failure, it is the system. A winning customer is a cost.
The volume model
Other sportsbooks do the opposite. They work with tight margins, accept large bets, and don't close accounts of winning customers. Profit comes from the amount of money flowing through the book, not from each individual customer.
For this model to work, prices have to be right — and the best way to keep them right is to let in those who know. A large bet from someone informed is a free correction.
Why their prices set the standard
Precisely for this reason. When a sharp book that accepts large volume moves a price, it's incorporating information it was effectively paid to receive. The price reflects the consensus of those who have the most to lose by being wrong.
Retail books tend to follow these moves with a delay. That lag is where many people look for an edge.
What this means in practice
A price from a sharp book is the best available estimate at any given moment. It's not infallible — it's an estimate, and estimates get it wrong. But it's the least wrong estimate available publicly, which is why it serves as the benchmark for everything else.