What damages are caused by mishandling books?

Books, especially paperbacks, are a fairly cheap commodity in terms of purchase. I think it depends on your perspective. To any book lover bending corners as bookmarks, breaking the spine, and generally mistreating a book represents a disrespect for the book and its contents. I think, as we live in the twenty first century, that technology has moved beyond chopping trees down to produce the written Word. I have an e-book reader (kindle) and this provides me with a library of books at the touch of a button. The love of books, and literature, should be for the content, not the structure and physicality.