College football is a farm system for the NFL, yet they are compensated similarly. The offenses and defenses are not as sophisticated and recruiting footprint matters more than coaching for the elite teams. None of those guys you mentioned could keep an NFL job for more than 5 years. Also, because of NCAA rules regarding practice and player contact, they don't even have to work as hard as their NFL counterparts. Lastly, college sports is the only business where an employee makes more than the President/CEO.