So, today's my last KDP Select free day, and the first time I've used BookBub. The BookBub ad cost $60--so slightly less than my first Facebook campaign, which was $70.
And I've gotten 10 times the downloads!
So, yeah, big ups to BookBub for being a highly cost-effective way to reach readers. Other advantages: They don't shut you out if you don't have a review average of four stars, and (although it costs more and presumably would result in fewer buys) you can buy an ad with them if you simply put a title on sale as opposed to making it free, so you aren't locked into KDP Select.
Oddly, I don't seem to be moving up the Amazon bestseller list like I did in the previous two campaigns (only at #14 now in science fiction: series, but at least I'm on the front page). I'm assuming that just a lag or a glitch, since that number hasn't changed since early this morning (and yeah, you can really tell when that BookBub e-mail goes out).
(Of course, it's possible that it's not a glitch--that Amazon doesn't count the BookBub downloads when compiling its bestseller lists. Which would suggest that, once the book goes free permanently, I'd actually be better off spending $70 on Facebook, because I'd get better visibility on the lists. Interesting.)
By-the-by: Before the giveaway, sales for February were maintaining their January levels, which were substantially higher than I'd seen before (although not high in any non-relative sense).
Moving on to reviews: I picked up three reviews over the past month--all of them were five-star reviews, moving the book from two five-star reviews to five five-star reviews. I happen to believe that psychological factors play a large part in whether people think a book that they enjoyed is worth three, four, or five stars. So, before I thought anchoring was playing a large role in the average star rating on the various Web sites.
This time around I think it's actually a response to those one-star reviews. The new five-star reviews are quite short, and I think what happened is that people enjoyed the book, and decided to have a second look at it on Amazon. Then they saw those one-star reviews, and thought, "That's SO unfair! Those people didn't even read the book! And that one is such a sanctimonious asshole--ooh, this frosts my shorts!" So instead of giving they, say, four stars, they get their dudgeon up and give it five.
Which is a reminder to myself that even jackasses have their uses....