But don't the bookstore chains buy from the publishers at a defined cost? In that case you already know what the net royalty will be before they decide what to retail it at. But you have worked in a bookstore so you may be able to shed some light on this.
That's what I meant by terms being key - what percentage the bookseller wants. And, under a net profits contract, the author's royalties go down or up based on that because the publisher's profit goes down.