In my view getting tangled up with mega famous stars as their doctor or pa can lead to problems unless they have a headstrong attitude towards their outrageous demands which can lead to your dismissal when refusing an absurd demand.
It's a dangerous situation to get into as the stars are paying their wages and are used to getting their own way and will be more then happy to pay for anything and have you take legal gambles in order to get their own ways.
The doctors, nurses surgeons and medical staff all know what they're getting into unless they're "green" and "naive" which none of them are but many have to play the game as if they were to not rock the boat and keep the large amounts of money coming into their bank accounts along with the accompanying lifestyle and glamour at having the status of working with the star in question.