We just did an analysis of our Google Books readers edition, which has been operating since 13 January 2010. The attached report is from our account with Google Books, and you may wish to consider comparing the CTR listed(almost 9 percent) with the information on this wikipedia report on CTR The bottom line? With super niche marketing, and online FULL access, we are running almost 2.5 x the CTR that is considered superb.
Perhaps you'd like to arrange a personal Right By My Side online learning session to see how this process and method can advance your online book marketing.
This is the BOTTOM line on that report. Send me a note for full report in spreadsheet format.
First column is total book pickups digitally
2nd column is pickups with BV click to read the book
3rd column is total number of click on buy link
4th column is CTR
5th column is total number of page impressions from book.