This is wrong.
I just looked at the 7 this year in the NFL.
Bengals/Browns landed on 7 on September 16th when the line was 7. Opportunities for the 7.5.
Miami/New England on December 2nd landed on 7 when the line was 7. Opportunities to get Miami more than 7.
Minnesota/Arizona on October 21st landed on the 7 when the line was 7.
Detroit/Green Bay on December 9th landed on the 7. The line was anywhere from 7.5 to 6.
Tampa Bay/NY Giants on Sertember 16th landed on the 7. Line from 7 to 8.5
Seattle/San Francisco on October 18th landed on the 7. Line from 7 to 8
San Diego/Denver on November 18th landed on the 7. Line from 7 to 9
So 7 games where the 7 did matter this year. Quite a bit different than 0....
Just looked at the 3 really quickly and it looks like there were 4 games that landed on 3 when line was 2.5 or 3 or 3.5... Did not look at the numbers 2 or 4