As an academic in training(phd student), I would never want to be a football coach at a top school. The hours they have to work to remain competitive are insane. One bad season or embarrassing loss to a rival and you will be fired. I'll take the promise of tenure over the extra pay. Also as previous posts have stated the imbalance in pay is skewed by comparing top coaches with all academics. I'm pretty sure coaches at a Div III school are not paid in 7 figures, probably not even 6 figures.