Not many people go to high school games anyway so it shouldn't even be a problem.
Think about how many high schools there are in america with football teams.
Maxpreps mentioned something like 14,000+ a few years ago (or so I read)
Half that since it takes two teams per game, so that is 7,000 or so games every friday during football season. Call it 6,000 to be on the conservative side.
If each one of those averaged only 200 fans a game, (and that is VERY low for an average, many around here draw in the few thousands, and up to 10,000+ for big games) then you are looking at 1.2 million people watching football on any given friday night (again actual number is likely double that at the least). I wouldnt call that small potatoes.