I have a lot of programming books on my shelf about various topics , but I don't have one called "make a shitton of money with your text editor".
It would feel a bit like those ebooks that promise to make it easy to generate effortless income on the stockmarket or get highly attractive women into bed with you.
I have no doubt that such books sell, but I wouldn't feel confident writing something that might not necessarily do exactly what it said on the tin for everyone reading it.