Politely, I believe that this oversimplifies it a bit.
Let's take something like a "Major Label..." recording contract...
Almost every time, the label will own an artist/bands recordings when all is said and done.
Should that ownership mean that the band gets cut out of the money made entirely if one of their songs is on a soundtrack that does big money?
I don't know that anyone should be making a killing off of "Work For Hire..." characters. That said, a slightly better deal for creators in not exactly handing the entire world to them on a silver platter.