Value is relative to a person. What maybe of value to one person not of value to another.

What may move one person to believe and invest time, money and effort may not work with another.

What drives and motivates people are largely different for each one and it is great that you want to put all of this together and try to make sense of it.

In a way trying to discern what is a steemian that adds value to the platform.

Although the analogy you used of trying to make posts and see what sticks is a different way of seeing what niche will work for a person.

I will be thinking more about this.