I've done this for years now: promoting products just to get the case without thinking of the future. Recently I realized that truly the money is in the list and that whatever I do I must be building a list of emails from people that are interested in what I have to offer. This way, when I send an email to 1000 or more people I know that some will buy because they are interested in what I will offer. What do you think? Is building a list worth it? Are you doing it?