Ah, gotcha. I sold one for profit, although I'm not sure if it's even technically made a profit yet. It costs a bit to put a book together, but I've probably broken even at least. I'm terrible at marketing and networking.
It's not a matter of not knowing enough about how to do it, it's just not my personality. I've learned a lot on the subject, but it's just not my thing. It feels too forced and fake to me.