Also, I often use montage sequences in my commercials. I like to edit and the editing techniques I use in commercial films end up in my films. But in my films I can do things I can't do in my commercials. For example, I could never show the hospital scenes in Byoin in a commercial. I did a lot of cutting for those.
Films are a poor medium, commercials, a rich one.
Even if a film doesn't make any money, I don't feel so bad about it. When I do nothing but commercials for any length of time, I start to feel that I want to do something longer. When I make a film I can stretch out more and I feel refreshed.