You probably shouldn't judge a book by its cover, but in this interesting article on the Mill City Press blog, Rejected: Real Reasons Bookstores Refuse Self-Published Titles, it's clear that most bookstores do. Mill City Press continues to present some interesting topics, and whether you are self-publishing or not, this article has some things to think about relative to making your book marketable. Everything from genre to the title of the book can impact how marketable it is. Hope you enjoy it as much as I did!