This is because different bookmakers and betting sites price up games differently. So the odds they offer are not always the same. Remember the Packers versus Cardinals game we showed earlier as an example? We used the actual odds from a real betting site for that example. The following odds were also available for the same game, from various other sites.
Sportsbooks will use a variety of methods to set their line on a game. Some firms will use computer simulations, some will use a form of power ratings, some will use an experienced team to set the line – some may even use a combination of all three. Other books may even wait to see where their rivals set their lines before dipping their toe in the water themselves.
You've probably noticed by now that in the first game there are no odds posted in parenthesis to the right of each team. This means that the sportsbook is paying out both bets at the standard odds for a point spread bet of -110. Some sportsbooks will write the -110 in, and some will just leave it blank assuming that you know they will be paying out at the standard odds rate.
A good rule of thumb with sports betting is that the sportsbook is going to put more time, effort, and resources into setting their lines on the sports and leagues that have the most action. This is a completely smart move on their part as it's where they stand to lose the most money if they make a mistake. What this means is that the smaller sports and leagues are much more likely to have bad lines or lines that don't respond as quickly to trends as they should. Regarding basketball, this means you may have more luck looking into college basketball or even the smaller European leagues. If you do choose to go this route, make sure that you do all of your homework and are not just jumping into a new league blind. College basketball and Euro league betting are NOT the same as NBA betting even though they are the same sport. This does not mean you can't bet the NBA and that you won't find great lines; it just means that the bad lines are more likely to be corrected quicker as the sharp bettors will jump all over them, and the sportsbook will adjust.
For example, let’s say you’re thinking about betting on something that is -3500. You are almost 100% sure that you’re going to win this bet. If you bet $100 on this bet, you’re going to see a profit of $2.86. Again, this might be worth it to you. An almost 3% return on a sure thing might be something that you’re interested in. However, if you’re looking to make any meaningful profit, you’re going to have to risk a lot of money. To win $100, you’re going to have to risk $3500.
Typically hockey is not a popular sport when it comes to point-spread betting because most games are decided by only a goal or two. Sports like football and basketball are better for point-spread betting mainly because they are higher scoring sports. However, Proline does offer NHL point-spread betting and it can get confusing so let’s take a look at how it works.
Notice that point spreads adjust the score for the favorite team. This is easiest to see with an example: If the New York Knicks are playing the Boston Celtics, and Boston is favored to win by a 4-point spread, then a bet on Boston only pays out if Boston wins by more than 4 points. A bet on New York pays out if New York wins or if they lose by less than 4 points.