Authors seek to appeal to a certain audience.
For example, Stephen King's reputation is built on his ability to create a successful horror novel. Imagine for a second that authors had no audience. Also, imagine that authors are obligated to prove authorship before their works are published. This concept seems alien to a modern audience, but this situation was common for African American writers trying to get published in America not too long ago. African American writers had to have the authenticity of their work evaluated and substantiated by a white person in order to get that work published.