How Does the Film Industry Actually Make Money?
nytimes.com
nytimes.com
Example: According to this, "Return of the Jedi" did not turn a profit.
http://www.techdirt.com/articles/20110912/13500315912/hollyw...
For example, many "non-profits" have associated entities that are very profitable.
[0]http://www.amazon.com/The-Hollywood-Economist-Financial-Real...
That assumes you know how to do that of course. People know and are comfortable with what they know. Drawing a comparison to a skill in another industry that takes years to hone really makes no sense.
A large part of not getting screwed in a Hollywood contract is making sure your percentage relates the right entity.