Sorry, I wasn't clear, nor did I fully comprehend your post it seems. The KDP reference was throwing me, as when I was still writing Createspace was for print (they hadn't been sucked into KDP yet).

Most of my royalties came from fiction, and that's spread around several sites. Ironically, KDP comes in fourth (behind Smashwords, D2D and Nook direct). D2D does offer print on demand (I haven't used it personally), however it is up to the author last I read on it to get the books listed on the platforms. Nook was also beginning to allow print for the B&N bookstore as well when I stopped writing/publishing.