When we started the Bookshelf, we wanted our authors to share in the success of their books, so we set our royalty rates to between 40% and 50%. That is, an author will receive between 40% and 50% of whatever gross profit we make on a book. We felt back then, and we still feel, that this is the highest overall royalty offered by any technical publisher (most publishers offer something in the 10–18% range).

But it isn't always easy to compare different publishers, because the definitions of...