I'm really interested in the 'fake' sales page idea, thanks for sharing the details. From these numbers, did you have a formula in mind that would determine if you could make money from the book? In other words, if you sell for $27, those 15 buys generate $405, which is obviously more than the $100 spent on Adwords. But how many of the 15 people who clicked Buy would actually buy? Also, did you list a price on your 'fake' sales page next to the Buy button?

Also, given your fake sales page experience, have you considered advertising with Adwords?