“Against the spread” refers to betting on a team to perform better than the point spread set by the sportsbook. They must either win by a margin greater than the spread (for favorites) or lose by fewer points than the spread (for underdogs) for the bet to be successful.
Quote from NY Post Point spreads are supposed to be the great equalizer. History has shown that the eventual champions are often underestimated by the composite sum of market influences, even when they’re media-friendly, high-profile programs. Consistently clearing high expectations is a sign of greatness.
It probably moreso reflects bettor fatigue, if anything
Not as exciting to bet on the eagles another year in a row and so they’re getting more favorable spreads.
More than likely though it’s just the randomness of how the final scores work out players don’t give a shit if they win by 6 or 7 because the line is 6.5.