We don't know, in many cases, the relative pay based on sales compared to the "bosses" - even in your example.
I don't now the higher ups at the Heat's pay.
I don't know what TomCruise gets for each viewing of MI4 compared to the studio.
We know contracts when they're published. And even in those cases we know top numbers, not the details or full bonus structures in most cases.
Alos, I know in many sports the salary arbitration process requires that every player and his agent, every owner and his negotiators, and every arbitrator have access to accurate data about what every other player is earning. Given that requirement, I imagine trying to keep the data secret from the public would be an exercise in futility.
I suppose sports and actors is the best example of similarity.