A book cover will spark a readers initial curiosity stopping them in their tracks to read the title.
A professional book cover will garner 25% more interest in a book than one thrown together with a few stock photos. Using stock photos can confuse the reading as there will be another book with the same images. The reader will give it a pass thinking they have read it. An author, especially a self-publisher author, who has control over their book, should regularly change the cover. This does not need to be expensive. ShearArt Book Cover design has hundreds of premade book covers and offers an affordable design service under $50. They also include exclusive rights to their illustrations.