The Bookmakers' Advantage

Updated: October 7, 2026

Oddsmakers are a talented bunch. They can handicap sporting events better than anyone else on the planet and are the best place to look if you want realistic odds on just about anything sports-related.

Few people doubt the bookmakers' abilities anymore and realize that they are usually right on the money with their predictions. Of course, some of the worst sports bettors around will say things like -the bookies got this one wrong,- and go on to explain how -the wrong team is favored.- If any oddsmaker was that far off on a regular basis, their sports book would soon be out of business. So we can assume that the ones that are still around are pretty good at what they do.

However, even if an oddsmaker is not perfect, one area that sports bettors sometimes gloss over is the built-in advantage that the oddsmaker has on every bet placed. This is known as the vig, juice, bookmaker's fee, and many other colloquialisms around the world. The -vig,- for short, is the edge that sportsbooks have on every bet placed. This ensures that they make a profit on their action and gives them an advantage on every bet placed.

Sports betting is all about beating the odds and overcoming that advantage. If you can mitigate or effectively eliminate the bookmaker's edge, then you are going to make some money betting sports.

Beating the Odds

Claiming that it's easier to beat the bookmaker's price is tempting, but deceptive. In today's era of sports betting, sportsbooks have implementations in place that can automatically move their odds based on various betting events. Many of these processes are automated, and there's always a supervisor at the controls during critical periods. Careful planning is essential to outsmart them.

The moment the odds change at one of the major sportsbooks, most of the industry adjusts rather quickly. It is difficult to beat the sportsbooks when it comes to breaking news or updates, and they are quick to remove markets when something comes up. Keep an eye on the rapid changes.

Bookmakers are more exposed to smart action than they think. That's why their betting limits vary by sport and category, and why they enforce night limits for overnight odds on the following day's events.

Internet sports betting has made sports gambling accessible to almost anyone with an internet connection anywhere in the world, but this advancement has also made betting marketplaces more sophisticated. Accessibility doesn't always translate into profits.

The ability to adjust odds and react to the market in a matter of moments will always give sportsbooks an edge over the vast majority of the betting population. The fact that they can exclude or limit players is another advantage in their corner. If a bettor persistently targets their weaknesses, the sportsbook can stop accepting their bets. Don't underestimate this tactic.

Vigorish Explained

In addition to their staff of managers and high-tech betting software, the sportsbooks have a hurdle for all bettors to overcome on every bet that is placed - the vigorish.

These standard 11/10 odds may not seem like much, but without them, sportsbooks would be out of business. If all their bets were charged at the standard vig, the break-even percentage for sportsbooks would be 52.4 percent.

Winning 52.4 percent of your bets may seem simple enough, but it is something that most bettors who walk into a sportsbook in Las Vegas or deposit online cannot accomplish.

And that break-even percentage is only if you pay -110 on each bet. Of course, some sportsbooks offer reduced juice (-105) prices, but most bettors don-t choose to use these markets or adequately line shop. In fact, many markets will charge bettors more than the standard 11/10 odds, causing them to pay even more in juice or vig.

How the Bookies Lock-In Profit

With the vigorish, bookmakers have a built-in profit for every bet that players place. This is because when two bettors take the same odds, the sports book pays out one side of the bet (the winner) and keeps the other (the loser).

10% profit on two bets may not seem like much on a small scale, but when you consider that some sportsbooks take millions of dollars in bets per game, this amount adds up quickly. After all, 10% of $1 million is $100,000.

Of course, it is not always that simple. Sportsbooks are not always able to get balanced action in all of their markets, but they do their best to make sure that they are not exposing themselves to too much risk. The reason why odds adjust so frequently is because managers look at their balance sheets on both sides and adjust accordingly.

Every time the oddsmakers adjust the betting lines, their moves affect the number of bets placed and the markets bettors are betting on. To outsiders, many of these moves may seem like minor adjustments, but these changes can drastically affect the betting action.

Bettors are still playing against the house when they bet on sports, but in many cases the bookmakers would prefer one side to win over the other based on the betting action. It is not as simple as a player winning money at a craps table or blackjack table. There is no potential positive benefit to the house when you win at craps or blackjack. You have simply taken money from the casino that they previously had.

However, the sportsbook may benefit more than just their 10% commission if one side has more money on it than the other. Sportsbooks often take a lopsided action on the favorites, which means they will generally be rooting for the underdogs.

In fact, usually when bookmakers have a profitable weekend on the NFL, it often coincides with professional-level sportsbooks or just profitable sportsbooks having a strong weekend as well.