<a href="http://kriswrites.com/2011/11/16/the-business-rusch-how-traditional-publishers-are-making-money/">This article</a> has another take on it - the big 6 are making more money than ever, and a lot of it is because authors get a much smaller cut of an ebook price than they do a paper book price.
if I've borked the link, the article is at:
http://kriswrites.com/2011/11/16/the...-making-money/