The concept of the show is that the boss (in this case, Miller) somehow disguises himself/herself and works with his/her employees. It's a way for the boss to find out what's really happening inside the business (in this case, the Utah Jazz) and get to know employees in a way they otherwise could not.
Word is that CBS and the producers were somewhat surprised at just how enthusiastically Miller joined in; that they were thrilled that he agreed to do some things they didn't expect him to do.
At the end of each episode, the boss reveals himself/herself to the employees and generally dispenses largesse in the form of promotions, money, etc. Occasionally, the boss also has to sort of snap back a wayward employee, although we have no way of knowing if that will happen in Miller's episode.