One of the topics that I teach in my First Year Seminar for freshman about College Football Economics is with regard to college football revenues. Here is a nice article on the top schools in terms of football revenues. Be mindful that this is a limited sample of schools, so the conclusions from the article are for this limited sample - a broader view will be different from only looking at the top revenue generators.
I hope to come back to this later and give a more detailed analysis of the revenues and expenses in college athletics (and hopefully for just college football).