Hardest part in publishing, is how many will purchase a creation in the different formats. I always divided buyers into 3 major categories, those that must be first [will pay the most for the privilege] those that must pay the least. then the rest , who may never buy but can always be temped. Then books come in different flavours. Bacon Some books are to be tasted, others to be swallowed, and some few to be chewed and digested: that is, some books are to be read only in parts, others to be read, but not curiously, and some few to be read wholly, and with diligence and attention. Sir Francis Bacon Thus the modern purchaser has more choices. Thus the Publisher has to be able to truly know his reader, as the first run must pay for all the inherent costs involved. The returns eat up costs galore, for ever lost. For example computer type books usually have two paragraphs of use, the rest has been said many times before. Many are just padding or waffle. The Market place is the ultimate judge, you can lead a readers to the cover, but it is very hard to force them even to peruse, let alone buy. Best seller , how many make it to list, http://en.wikipedia.org/wiki/List_of_best-selling_books No of books published and sold vs no. making the million in the first edition.???????? Publishers always have high hopes of hitting the jack pot, see how many turned down J K Rowling . The e book will be a nitch item, it is just question of the level of satisfaction, once read will it be left for the mildew or will it find a place for future use and generate additional revenures.. just a thought.