Synonyms for vanity include egotism, pride, emptiness, and worthlessness.
Publishers sacrifice the profits from all books to support and promote a small number of books.
For example, let's say the publisher is disappointed with the sales of your book. If sales are dismal, he is NOT going to spend the sales dollars for your book to promote your book. Smart business, yet disappointing for unknown authors who assume the publisher is promoting their book. Sometimes the quality of a book will determine its success. If you've sold out to a publisher who is not promoting your books, ditto.