I am reminded that you don't think it's the central point of the movie, but that's even what the stars in it are talking about.
Money?
The stars talk about what they are asked about. It is what has caused the most talk about the movie. The fact remains that that isn't what the movie is about. Not that people always get the point of movies and books. Fight Club is ultimately anti-violence but all anyone who didn't like it said was that is was very violent. Do you think The Passion was about the violence in it or Jesus' sacrafice? What did people talk about?