A book does not show the "Author Earns" slider if it is under a publisher account. The reason it works that way, is in a publisher account, all the royalties go to the owner of the publisher account, not the authors of the books. It is the publisher's responsibility to then distribute the funds to their authors, and we don't want to display an "Author Earns" slider when that decision is actually up to the publisher, and may not be public knowledge.