Taking this line of thought to it's logical conclusion, how many real "books" are actually just a simple way of laundering money? I mean, who actually buys the book by Rick Santorum?
That's a good point. Few actual people want to read Newt Gingrich's political autobiography, yet it was a New York Times bestseller based on sales. And Romney has done similar things http://www.salon.com/2010/10/15/mitt_romney_book/
And in any case it's not necessary to use fake book. You can publish a 10 page "book" with your random doodles and use that.