I self-publish my books. The audience is decent, I publish shortened audiobook versions for free, but frankly, I like the fact that the paper books themselves are copyrighted and no one can print them extremely cheaply and flood the market with them at my expense.
> I like the fact that the paper books themselves are copyrighted and no one can print them extremely cheaply and flood the market with them at my expense.
Having something that is paper doesn't mean that no one else can print them cheaply and flood the market. While it might not be at your expense - it certainly isn't something that is making you any money.
I don't self-publish on Amazon, though. I print my books in a local printing shop and sell them using my e-shop (Wordpress for blog, Woocommerce for e-shop).
I stopped self-publishing my books, because as soon as I offered PDFs to those who purchased my paper books the sales of printed copies tanked. Then nobody wanted to pay for PDFs and Amazon screwed my KDP sales (banned my book). The readers felt entitled to free copies and free consultation on the subject of the book. It's really depressing how entitled people feel to other people's creative output or knowledge.
It would have been natural, but also depressing.