For the sake of it

Is a concept, an ideal, or any form of intangible being in need of contribution? In need of a voice, a vote, a presence within the world simply for the "sake" of it? Should I practice my handwriting for the "sake" of calligraphy or the art of ink to paper? Is it appropriate that I pay for every movie I watch for the "cause" of cinema? Does the impalpable need human beings to contribute to their being for the "interest" of them? Now this dialogue has links to many other arenas outside of the arts, although that is where the root of these thoughts come from...What qualifies something as being a "worthy cause?" Let me hear your thoughts on this...