"They may forget what you said, but they will never forget how you made them feel." -- Carl. W. Buechner
This concept is the core basis of why you should be writing. Impression. Impact. A memorable experience. Whether discussing nonfiction, fiction, poetry or scripts, the end result of a piece should be weighed by its take-away value.
We write to entertain, to educate, and as selfish as it sounds, to be remembered. I once participated in a blog discussion contained in the comments following the post. It turned almost into a chat session, all about how and why a writer writes. The blog owner professed that the writer needs to satisfy himself first and foremost, because he cannot be all things to all people. He had about thirty thousand blog readers, so the list extended to a couple hundred comments, especially once it became a debated topic.
After reading several dozen "I agree" echoes to the author, I took a stand otherwise. If an author doesn't write for an audience, he writes for himself alone. Sure, he has to critique and accept his own work as credible, valueable and polished, but if he doesn't envision a readership as he composes, he runs the risk of missing the mark. The piece becomes a soliloquy . . . to an audience of one.
The blogger ardently disagreed with me. The conversation turned into a chicken-or-the-egg dilemma. I quit arguing first, saddened at his followers believing that self-satisfaction was sufficient for good writing. Readers could enjoy or move on to someone else, in their collected opinion.
Personally I believe many memoirs fall on their faces due to this misunderstanding. Even though the story is personal, it has to be conveyed to a sea of many, and therefore, written for the masses - incorporating them in the message, even if the message is founded in the author's life.
Understand and thrill the readers you've defined as your niche crowd. I'm not declaring you sell your soul and pimp your work. Just create stories like the artist you are - for the enjoyment of the public.