keep on mind that line is just to balance the bets. Ideally they want half the money on each team. It doesn't means they feel a team will actually win by that many points.
It actually does indicate they think that team will win by that many points. Every other prop on the game stems from the original pointspread. The money line (straight up odds) is based on a chart flowing from the pointspread. Pointspread props, like Minnesota -6.5 -150 (actual number from 5dimes.eu) are based on the original number.
In the late '80s on the Stardust Line radio show I got chief Nevada oddsmaker Michael Roxborough to concede that the pointspread is indeed a prediction of the outcome. He was not reluctant at all. Roxy was always a straight up guy, in such contrast to all the goofballs in that town who love to perpetuate the myth that sportsbooks have some secret behind the scenes formula and also special connections, ones that enable them to trap bettors into taking the wrong side, etc.
If everybody could work behind the scenes in a sportsbook for one day they would see that it is nothing special at all. Nobody knows a darn thing. It is a bunch of guys who want their shifts to end. The boss hopes everybody shows up, and that his boss doesn't yell at him, or make his presence felt at all.
I realize I could post this 1000 times and people won't believe it or accept it. The next time this topic emerges we'll have the familiar assertion that a pointspread is not a prediction of the outcome, but merely a vehicle to balance the action.
The pointspread doesn't need to perfectly balance the action. It is rare to have a similar amount on both sides, even if the number doesn't move all week. But the win is higher than the loss. That's why the books don't care about truly balanced action. The computer might show you will lose $15,000 if the favorite covers but win $26,000 if the underdog covers.
You take that type of split all year. Just keep putting out a number based on the power ratings and a home field adjustment. That method doesn't require much thought and it doesn't lead to second guessing. It will split the action well enough. Then do the same thing thousands and thousands of times per year.
BTW, there has been money on the Vikings. Spread is back up to -7.5 and looks like it might go higher.
Late money has been showing against the Dolphins every week for the past 5 or 6 games. I mentioned that in a prior thread. It might have been the reason some books opened the number seemingly high at -8 and even -8.5, before it was pushed down on Tuesday.