It is gratifying to see that the new annotated works by Rabbi Hartman are now available online via HebrewBooks.org
This is a major development, as typically HB only uploads Seforim that are not under copyright. Obviously, they must have been given permission by the author/publisher.
Very few Seforim actually make any money. While I am pretty sure that this series did, still most authors can't publish because they are unable to find patrons to subsidize the cost. The Electronic Age can remedy that situation, as a simple email with your Sefer as an attachment can now be converted to PDF format. The Sefer can then immediately be available to any interested party worldwide. Amazing!