They have a very weird scheme, with production companies who always make a loss and agencies who make enormous amount of money with the whole star system. It's very complex, but totally artificial. Look at South Korea, they made a star system out of computer games.
This scheme works only in combination with media, what gives them the ability to make marketing and stars at the same time. The big cycle is:
Make a movie -> your newspapers write about the movie or the actors -> people watch the movie, actors become stars -> make money with print
This is the whole reason these conglomerates exist, there are not many synergy effects in print. It would be totally decentralized/commoditized, but when you sell your PR as content.... big profits.
These big schemes have always have flaws, but we need insiders who know where to find them. I am interested in this topic, but all i know are from very few sources. Most of them books, or public funded contend. When i think about it right now, it's totally obvious.