Normally, the publisher will set a budget for a book which will include the costs of editing, printing, distribution, payment to author(s) etc. and will rely on the sales to recoup the outlay and hopefully make a profit. If the projected sales don't cover the budget, the book doesn't get published. Very true. Or they take the loss. That is one of the reasons that you don't see books published on every software program .. only the ones with the largest user base. So, the way to offset the costs of administrating, publishing, and distributing the book is to go to those people you said the book would be exposed to, and ask for advance orders. But it is not only unfair, but very disrespectful to ask those who are providing the content to pay for the costs of printing the book. If anything, Renderosity should be paying those who are selected, even if it is with a free copy of the book.