It has nothing to do with commercial success. You cannot calculate in your head how to put the mosaic together to make a commercial film: that's out of the question.
One of the characteristics of the dream is that nothing surprises us in it. With no regret, we agree to live in it with strangers, completely cut off from our habits and friends.
You know, the way art history is taught, often there's nothing that tells you why the painting is great. The description of a lousy painting and the description of a great painting will very much sound the same.