Surprisingly not worth it for many, most of these coaches have seven figure salaries and are employed for years or even move on to the higher pay in the NBA, they wouldn't want to jeopardize that.

Plus some of the higher paid coaches wouldn't go along with it because it's too risky. Use Duke's coach as an outlier, he earns $7 million a year and has been with the team for thirty years, good luck getting him to risk that career for twice his annual salary.