Williamson County does not pay head coaches much money compared to other school systems. A head football coach in Williamson County earns $6,000. In Davidson it is a percentage of gross teacher pay (10%). Assistant coaches earn less. None of the TN counties you selected pay $70,000 per year! I have no doubt some booster clubs kick in extra money in some places but all of that would be on the books if they follow the TSSAA regulations. It is true that some Alabama schools pay $10,000 or more per year than TN schools.