I'm not disagreeing with your point regarding wealth, but football is the most popular men's high school sport (by participation) in the country so your experiences aren't likely the norm. Also track, tennis and gymnastics are mostly individual sports so they're less likely to be the ones driving the same level of school-wide support and pride (logos on the masthead, trophies in the hall, etc).
Also HN readers might be unlikely to have had the average American high school experience.
Also HN readers might be unlikely to have had the average American high school experience.