If the public comes out and bets really hard on one side, the line is going to move a lot making the odds worse on that side and a lot better on the other side. If you’re planning to bet against the public, you should wait to bet until the line moves as far as you think it is going to. Be careful, though, if you wait too long and some big money bettors bet, they can move the line back.
The sportsbook will sometimes move this line if they need to encourage more bets on one side of the game. Their end goal is to have the same amount of money bet on both sides of the game so that no matter who wins, they make money. For as much as they love to facilitate gambling and betting, they don’t like to leave things to chance for themselves.
Earlier, we explained how the implied probability of -240 is 70.59% and how the implied probability of +210 is 32.36%. Notice these two probabilities total 102.95%. The extra 2.95% is the bookmaker's advantage. It's called vig, and it's basically a commission that they charge customers for placing wagers. By removing the vig, you can see what the fair odds on the game would be.
You don’t have layers of complexity to fight through to see if your prediction is a positive expected value move (one that is going to make you money). With some simple mathematical calculations, you can figure out whether or not there is value in a bet. Even if you don’t like math and would prefer not to use it when assessing value and making your picks, it’s still much easier to “eyeball” value with moneyline bets because of the simplicity.
It's inevitable in sports and basketball that in each game one team is going to be better than the other. Betting would be a little pointless if you were able to make the exact same wager on each team. Everyone would just always bet the better team, and the sportsbook would quickly be out of money and have to close up shop. What point spread bets attempt to do is even the playing field and offer bets with the same risk level on both sides of the coin. They effectively aim to create a 50/50 even playing field.
The point spread, which is sometimes referred to as the “handicap”, is the number of points taken from the favorite, or given to the underdog, in order to open up the chances of either team winning the wager evenly. In most games, there’s usually a team that is more likely to win, based on a number of statistical factors. If the only kind of wager available was on who would win between a very strong team and a poor team, it wouldn’t be all that exciting. The point spread was designed to make betting much more interesting, since it allows a bet on the losing team to win you money. How? Let’s break down an example: