If you were to judge your favorite book by its cover, would you still read it?
I never look at a book's cover when I am browsing the book shelves. The most important part of the book, other than the content, is the inner flap giving a brief synopsis of what lies in the book. I really couldn't care less for the cover art unless it's a book meant for display, then obviously the cover art needs to be visually pleasing. However if the book is meant for reading, that inner flap needs to be well written and a very good tease of what I can expect. I like to be drawn in and surprised, book covers have never done that for me.