I just found this article about some of the stadiums having empty seats:
http://www.thegatewaypundit.com/2017/10/nfl-hell-several-stadiums-nearly-empty-anthem-protest-backlash-rolls-week-7-photos/
Those seats are empty because the ticket holders are at the concession stands, loading up on food and such.
:)
[That is the likely excuse coming out of the NFL main office later this week.]