Ask HN: Why do you subscribe to newsletters?

The popular startup wisdom dictates that newsletters are only growing stronger, with more people opting out, and new companies built around them. As someone who unsubscribed from 90% of the newsletters, I can't relate, but I'd love to understand what drives people to sign up, and what value you are getting.

If you could share your personal experience with newsletters, and what makes them good (and bad), I'd love to know your point of view. Thank you!