Онлайн > оффлайн. США, 2013

BookStats estimates that US publishers made more money from online orders and e-books in 2013 ($7.54 billion) than they did from old-fashioned physical retail ($7.12 billion). While the difference isn’t huge, it suggests that a large chunk of the American population is content with buying books that it hasn’t seen in person.
http://www.engadget.com/2014/06/30/publishers-make-more-from-online-sales/