May was a pretty good month. I had a BookBub Featured Deal for Daros on April 30th, with the book continuing free for five days, and that netted 10,081 downloads the first day and 14,341 over the five day promo. That’s a lot of books in people’s Kindles, although only a fraction of everybody who downloads is going to read it, and they may not read immediately.
The promo did a few different ways, as these free giveaways always do. One is obviously the free downloads, which gives the book to a bunch of folks who might not otherwise have discovered that book, or hopefully, all my books. Another is Kindle Unlimited page reads. When that many people download one of your books, the Amazon algorithm starts to think highly of it, and it pops up more for people to discover. There’s also likely a word-of-mouth boost as well, but that’s hard to quantify or track. You can see the results of the promo in my KU page reads here on a plot of the last 90 days:

Daros is yellow, and you can see that it grew massively after the promo on April 30th. The light blue is my Inquisitors’ Guild box set (three of my fantasy detective novels). They’re still riding high from a BookBub promo in February. Here’s the 90 days before the above graph. Note the axis here is 33% bigger numbers than for the last graph.

Yellow is Kenai here, with Daros in red. It’s clear the BookBub Featured Deals have a huge and lasting impact on KU page reads – I’m four months out from the box set promo and still seeing elevated reads.
A third way the promo helps is in reviews. Daros was at 162 ratings and 38 written reviews on Amazon prior to the promo, and now, a little over a month later, it’s at 315 ratings and 50 written reviews. There’s been similar movement on GoodReads and BookBub. That social testimony is valuable both when people see it and for the algorithm on Amazon to boost my book.
Finally, and this is new for this promo, I saw a big increase in audiobook sales for Daros. I only have audiobooks for four of my nine novels, and I don’t think I’ve had a BookBub for any of them while I’ve had the audio out. I had 107 audiobook sales over the few days surrounding the promo, which was really cool. I got the April payment from ACX just a little bit ago, and the per-book rate was a good bit lower than usual for me, so it may be that these folks were getting the book in a way that costs them less – I’m not quite sure what’s going on there. But it’s great to have people listening.

Revenues
I’m Amazon-exclusive for eight of my nine books, so my revenues are pretty easy to calculate. In terms of sales, I had 64 paid sales:

Daros in light blue was most of them. You can see a slight uptick after May 25, which I think is the Facebook Ads – a couple people bought my whole Inquisitors’ Guild series at once. I also had 47 audiobook sales, most of them at the start of the month from the Daros promo.
For page reads, I had a little over 100,000:

Daros is the big winner here in blue, with the Inquisitors’ Guild box set in yellow.
The Amazon revenue there is $538.77, which is a good month for me – more than double last month. That’s mostly the BookBub bumping up Daros. It’s 88% Kindle Unlimited, 16% ebook sales, and 2% paperback. With 47 audiobook sales, you can probably add about another $70-100 onto that, so let’s call it $610.
Expenses
The BookBub and associated stacked newsletter promotions for Daros were about $650. With the audiobook sales bump last month, I’ve probably broken even on that this month, and Daros sales and page reads should stay elevated for a while longer, so that’s a win. The visibility boost, word of mouth, and additional reviews are on top of that.
One other thing I did this month is that I started advertising my Inquisitors’ Guild series on Facebook. I used my most successful ad to date, one with some custom art I commissioned. I’m running them at $20 a day, and I’m getting a $0.27 per click rate, which I’d like to see higher, but it’s a lot better than my other Facebook ads have been. At that rate, I’d need about one in ten people who follows the link to either buy an ebook or read on KU, but because there are four books in the series, some folks will read the whole series, and if everybody did that, that’s more like 1 in 40, or 2.5%. I don’t think I’m that high in terms of sales, but I am seeing an uptick in paid sales. The KU data are too spotty really to see a signal. I spent about $140 on that in May.
I spent some money on a hotel going to ConCarolinas at the end of the month, where I was a guest and did five different panels. I wasn’t there to sell and didn’t have a vendor table, so I’m not going to count that as a book expense for me – more of a fun weekend, with costs for which I had no expectation of making revenue.
Analysis
If you count the $650 in BookBub and other promos plus $140 in ads, I’m at about $790 in expenses, which is clearly higher than the $610 in revenue I’m predicting. However, I also made $115 in Daros audiobook sales at the very end of last month, which was because of the promo. Adding that in brings revenues and expenses much more into line, and I should see elevated Daros sales and page reads for at least another month or two, so I’d say that’s also a win. Even if we don’t count the future benefits, I’m at $765 in revenues, $790 in expenses, for a loss of $25, one I’ll easily make up this month.
Whether the ads are a good investment remains to be seen. Next month, any impact they have is likely going to be blown away by the upcoming BookBub Featured Deal for The Glorious and Epic Tale of Lady Isovar, which runs June 10-14. This is the first time that book will be featured, so I expect it will do pretty well. I’m not including the expenses for that in this month, but I will next month, when it goes live.
Links to books mentioned in this post: