I've gone this way with a number of my books for many reasons, the main ones being:
- zero initial outlay of cash
- ease of publishing in print and ebook formats
- reach for readership
At the end of the process, you upload a pdf or doc document, formatted to their specifications, and can have it produced in print, ebook, or both.
The real winner for me, as I imagine it would be for most writers, is the reach that Amazon, the 800-pound gorilla of the publishing world, has to offer for you and your book. My first book, Here Be Monsters, has sold about 10,000 copies worldwide since publication in 2013. I got feedback from a reader in Australia who was reading the print version within a month of hitting the "SUBMIT" button on KDP, and one day a few years ago sold a few dozen copies in Amazon's Indian market (I like thinking about a huge bookclub in Delhi discussing my Adirondack Murder Mystery).
If you're interested, and/or have questions about the chapbook or how I use KDP, please feel free to get in touch with me... I'll try to answer your questions, and if they seem to have a broad appeal, I might address them in a blog entry.