Alex Mandossian was the first person to teach the concept of student, affiliate, partner. What he means by this is that you are first connected with people online when they are students of what you are sharing online. They can then become affiliates and promote what you are doing, and finally they may put themselves in the position of being a partner.
With your list, tell them about this concept and offer them the opportunity to become a joint venture partner as soon as they are ready. It will not matter what niche they are in, and the results are completely up to you. Form these strategic alliances early on with the people who have trusted you to send them regular information on your topic. You may be pleasantly surprised by the results.