To continue; what do these books have in common? What are common elements of back cover copy? What all 
can be included? Between all the books here is a list of elements that can occur:
Publisher name
Book title
Quote from book
Tagline for book
Barcode
Copyright information
Book price
Cover design credits
Series information
Page Decoration
Additional Illustrations
Genre
Recommendations
In fact, I did not include the many, many books which consisted of 
only recommendations on the back cover. Here's a list of how many elements the previously given example contain: 
Rose in Bloom - six elements
Red Rain - three elements
Supervillain of the Day - three elements
Fire and Ashes - three elements
Finding the Core of Your Story - four, possibly five elements
Radialloy - four elements
A Little BushMaid - seven elements
Faces of Fire - four elements
Song of the Wanderer - Four elements
And here are a few more examples:
Attachment:
			 books.jpg [ 623.47 KiB | Viewed 593 times ]
			books.jpg [ 623.47 KiB | Viewed 593 times ]
		
		
	 The Theif - six elements
The Queen of Attolia - six elements
The King of Attolia - six elements
The interesting thing about these three books is that the elements on each is different, but the number remains the same. Leading me to believe that perhaps the key to a good back cover is to put many elements on it, regardless of what they are?