I'm sure there's an amount of money that could change his mind.
Booger is not about to approach paying a HC top money.
Do you see Swinney just standing idly by while Booger makes HC announcement for the team he coaches? His AD doesn't get involved at Clemson.
Besides that, its not about money and no owner is getting beyond the Belichick/Reid area of 10M. For Swinney, it's having it made like he has at Clemson with perpetual recruiting of 4-5 stars with only Bama, his ultimate stop being better.
The other side of that is that Swinney is well aware of what happened when Saban, Spurrier, Petrino and Kelly went to the NFL. They couldn't get back to college fast enough. 80 player rosters with 60 active is a hell of a lot easier to coach than 53 and 45. Injuries in the NFL cost HC their jobs.