One of the biggest mistakes I see newsletter and e-zine publishers making is writing about non-congruent topics that their readers may not be interested in. Sourcing a crowd of loyal readers requires a certain sensitivity to why your readers chose to subscribe in the first place – what was your promise?
I recommend surveying your readers from time to time and rewarding them for taking the time to respond with a high value e-book, audio file or video. Provide a few topics that you are thinking about publishing on and ask them for suggestions of the topics they are hoping to learn more about by being a subscriber to your list. This will provide a sense of ownership among your readers and you will inspire a sense of community among your subscribers.