Why would they do this? Because Brushwood realized that the top ten books in iTunes were all erotic fiction novels (erotic fiction novels are killing the charts because of the success of the Fifty Shades of Grey trilogy) and figured they could prove how ridiculous the general public, sex books and the best selling system all is. According to Young:
“It all started with Scam School Book 2—Brian’s magic book. He found out as he was pushing that book that the top ten in iTunes was all erotic fiction. Even to the point where established authors, like Janet Evanovich, couldn’t break into the top five of the iBooks store-because of all the erotic fiction that was capitalizing on Shades of Grey. And he thought-we could do that!”
More:
http://gizmodo.com/5933169/how-a-fake-crowdsourced-erotic-ebook-hit-the-top-5-of-itunes