Obviously there are alot of people on this forum, that are successful publishers. Can you give any insight into where you get the information for your products? Is it public domain info, you write articles using your own knowledge, you use other peoples information (with their permission) or something else?
I put a lot of reseach into my products - especially e4e. My uncle works for our states power company (energex) and helped me with a lot of my book.
I will usually research a lot (google) and then find a few of the top ebooks in the niche. Then try to compile the best of all and make a superior product. (only have 1 CB ebook, but I have countless ones via paypal that I market myself).