What you said is absolutely what happens to everybody in steemit I guess I could so relate and this is what motivates me to keep posting inspite of the fact my efforts are not rewarded and people are unable to recognise the potential of my content.
Most the posts does not make any money like you 6 chapters out of 7 for the book. But the patience pays off. I keep on creating videos (guitar lessons) for free which mostly goes unnoticed and efforts are not paid mostly but it's an addiction and sometimes good days come. But as you said it is fun and you kept doing it and so do most of the people who do will eventually get rewarded.