Not every school has that many, we're in Minnetonka which has 3400 students. I'll have to ask one of our club's age group directors who coaches at the neighbor HS. In MN it's not a requirement for coaches of any sport to teach. This past fall the 9A girls coach was my daughter's U13 coach, a arrogant Englishman with a temper who git kicked out of 3 HS games this past fall and quit on my daughter's team in November. He also holds a full time consulting job, and is a USSF C license coach.