From The Guardian: Book covers: the pictures that sell thousands of words.
So the blurb must be short and punchy, and the cover must make a winning pitch. Ideally, it should display a strong, memorable image. Many of the titles in the AbeBooks selection fulfil this criterion.
Associated with this data, from the Lost Book Survey of the 1970s, came the news that an extraordinarily high percentage of readers who went into a bookshop to acquire a particular title, actually came away with an unintended purchase.