Kindle v Draft2Digital

For the past few months I have been running an experiment. I took three of my books, Blood Orange, Honey tree Farm, and Bottle Alley and listed them on Draft2Digital. 
Draft2Digital publishes your eBook in most of the formats not just kindle. I promoted the heck out of these three books. I used social media, MailChimp and everyplace else I could think  of. 
I was really surprised by my results. I didn't do very well at all. Not nearly as well as I have done using the Kindle free promotions.
For anyone that doesn't know about the Kindle free promotions,  here's how it works. You offer your Kindle free for any five days in a three month period. You are paid from the Kindle Global Fund for each page that is read.
In the month of September, I sold one book and my royalty was .37 cents. For the same month I promoted one of my books for free and received $18.32 before the free pages were added in. How did you get royalties on free book you ask? Readers who saw my free book also bought my other books. You can't do that with Draft2Digital.
I know it sounds crazy. Promotion and visibility is what sells books.
During the summer I also finished and published my fifth children's book in the Hayden series. Hayden and Fred is a simple look at how a caterpillar changes into a butterfly. It is available as a paperback and as a kindle. I'm rather proud of the Hayden series. It's written to help children explore their world and help endangered creatures.
I'm also almost finished with the fourth book in the amazing Green Lady Inn series. Hopefully that will be out before Christmas. I'm a little behind on all things. I had shoulder surgery this summer but I'm back to using all ten fingers now.
If you have questions about anything please leave a comment or contact me directly.
[email protected] I'd love to hear from you.