"Film is a lark to me - thank God I don't have to make a living from it"

Huey Lewis is revealing his gratitude for the truth that he does not have to rely on film as a source of income. He is glad that he can take pleasure in film as a hobby, or a "lark," without needing to worry about earning a living from it. This recommends that he knows the problems of making a living in the movie market, and is grateful that he does not need to deal with those difficulties. He is also expressing his appreciation for the truth that he can pursue his enthusiasm for movie without having to fret about the monetary ramifications. This quote is a tip that it is essential to be glad for the things we have, and to value the chances that come our method.