This kind of money is offered because a great football coach is worth it!
These programs can net $3 million for each home game they play. You add in bowl revenue, merchandising revenue, sponsorship revenue, radio & tv rights revenue, and donations (both athletic and non-athletic) which all increase when you have a winning team and you can see the impact that a successful coach can have.
On the other hand, a poor coach in today's market should be arrested for robbery at the salary packages out there today.
I firmly believe that coaching is more important in football than any other sport!
Nick Saban is not changing jobs for the money. He is about conquering the next mountain. He's already proved he can win in the SEC and win a National Championship. He wants to prove he can win a Super Bowl now.