Sportsbooks move the line to make it more appealing to bet on the unpopular team and less appealing to bet on the popular team. You might find that the Titans become 9.5-point favorites, 10-point favorites and then 10.5-point favorites. If most people bet on the Niners to cover, the sportsbooks will move the line. For example, let’s say the San Francisco 49ers open the week as 8.5-point favorites against the Seattle Seahawks.
Lines also change to reflect each team’s popularity among bettors.
