The first major reason usually involves some type of major announcement on a team. Every situation is different, but there are a couple of main reasons why this happens. In some cases, it will move quite a bit up or down. Just because a particular option debuts as a +400 does not mean that it will stay that way all the way up to the day of the contest.
Only occasionally will there be huge differences. There’s no right or wrong money line set as the standard, but most sportsbooks are pretty close to each other. If you already have an account with different sportsbooks, and feel confident with that pick, it makes sense to get the best odds.
In other cases, the payout might only be +350. With a +400 example, there might be some sportsbooks offering +450 for the same team. When comparing different sportsbooks, The money line can differ a decent amount. Sign up for a FREE Consultation to start working with Legendary Sports Bettor Jon Price Why are Some Money Lines Different?