That's a very strange concept for me, you supply the Master license and they still own you and keep you in the dark. What does that tell you? Feels like you are still a a pawn and a tool for their profit. They don't tell you how much he earned well that right there shows a lack of transparency. What happens if they owe money some day, since you are in the gimmick you are just as accountable?
Here if individuals in a group of people who hold only a portion of all the ministry's licenses and one of them leaves then they have 60 days to find someone with that license otherwise the whole business has to shut down and is not allowed to contract and work in any way shape or form. Let's say one of the guy leaves the business with one of the licenses without telling you and you are working on a project and you need to shut down because all of a sudden you are working illegally you are still obliged to finish contracts and probably liable with late fees.
Nope not for me. First rule I learned from old timers on PZ NEVER WORK FOR A GC!