I have been quite passive with my customers, probably a flaw in my engineering decision making. But I have received little feedback from paid customers. They a

I have been quite passive with my customers, probably a flaw in my engineering decision making. But I have received little feedback from paid customers. They are quiet. I also think the way you treat customers has a lot to do with the cost of the product. Sell a 10$ book, at most you can hope they buy book 2.