It's a win-win for Singerman but a lose for Kai, Dana, etc.
If Kai, Dana etc are smart, they will have a contract that gives them a % of the gross profits, even if it's a smaller % than net.
This way 'expenses' like leased Lamborghinis, expensive lunches & 1st class airfare can't be siphoned off the top, leaving little in terms of actual net income.
I'm sure they thought of this since bodybuilders are real smart.