I think it is the other way around. Amuse yourself. Write for you. Fuck the audience. I have seen everyone that I know personally who have done for themselves, have had much greater success at making a living.
Most of the time when we have written our resumes, supposedly for ourselves as written of here, it isn't REALLY for ourselves. It is writing through filters. I am writing that, it may seem we have been writing for ourselves, but we really have not. Write what you want to read. Joyously.