Have you ever published on Lulu.com?

You are exactly correct thebeaddoodler. Promotion of any product will be up to the writer for the most part, except in rare occasions. However, promotion does not have to be all that difficult, especially for a writer. Press releases, taking the time to meet with local newspaper editors - especially weekly and smaller newspapers, talking to local radio personalities, and even setting up booths at conventions that are relevant to your book subject can go a long way in promoting your product. Never forget how important it is to let friends and family know and ask them to tell their friends as well. Write and submit articles and use your bio to your advantage.

Thanks for the feeback. I am thinking of publishing there myself. I wouldn't expect massive sales, but it would be nice to sell a little bit. I have a blog already in the topic so I'd use it to promote it.

Thanks. Good luck to you as well. I find Helium quite easy - it doesn't take too long to write one article. But a whole book just takes a lot more time...

Thanks for the idea. I am always sceptical with sites with such a low payout - it usually means that you find it hard to earn more within reasonable times. I write on Helium and it is okay to earn there.