So much depends on packaging.
I’m editing a book for another self-published author, and the information inside it is gold (it’s nonfiction). But the way it’s presented has no allure to the potential buyer whatsoever. This is the pain of all of us self-published monkeys: unless we recognize how we need to present our books so they actually sell, and unless pay the right professionals to help us, we’re fucked. That’s why you hear all this moaning: “Well, why in hell isn’t anyone buying my books?? I spent so much time on them! Poured out my soul! Screw it. I quit.” Or you hear blaming. Or whatever. When the real reason is, it simply doesn’t look like a product people are used to. It can’t compete. And so it gathers dust.