Simon Kinberg sort of answered this question re salary:
Q. Do you feel that the casting list for Poland is of importance to the story or just because. Hugh and Halle are the headliners, (Why is that!? Just most well known or something?) and then Ian and Famake, Anna, Kelsey and James follow (I can't make out the rest)... So whats up do you agree with the way they credited or would you have done it different? Will it be different in America? If you would have list them please. As always thank you for your time.
A. *I have no idea how it will be in America. The cast list has nothing to do with the size of the part, and everything to do with the level of the actors celebrity. The studio believes Hugh and Halle are the biggest stars, so thats how they advertise it. Hugh and Halle got paid the most, so they should be headlining. But Storm is not the second-biggest character in the film.