[Interesting Substack feature] (https://medium.com/linda-caroll/how-substacks-new-gold-stars-will-help-writers-get-results-9fc6fdc6342a): your readers are given star ratings visible only to the newsletter owner.

As the article points out, you can give special offers to people who are actively reading your newsletter and weed out those who just wanted the freebies.

I’m also thinking about this for educational purposes. You know exactly which students are engaged enough to open the emails.