Nietzsche's Zarathustra preached just for one man, dead man besides all. It's like to have an account with one friend on facebook and to be sure she will never read your posts.
The writer who goes public with no chance that public will read her is a kind of Übermensch. When the writing is done not for money or fame, not for impact, not for social change. When you continue to write with no personal need. When you write from Beyond.