I realized that there is an issue with trust in sales. I'm an outsider for the industry. So, I decided to set up a free newsletter which could immediately bring some value, a paid exclusive newsletter for publishers and a tool to collect book information all over the internet.
All these products are technologically part of the predicting system I'm building. So, the overhead is not that big.
Hopefully, if I could bring enough value with a free newsletter and simple paid service I would have enough trust to sale a modeling service too.