I made, like, <$20 on my books last year, an all-time low. Granted, I had nothing new out and didn't promote much, but it's another step in a long slide from my long-ago peak of a couple grand, and coupled with the fact that I have several completed first drafts that I feel no inclination to work further on, it's kinda starting to feel like it's about time to wrap this writing experiment up (or evolve it into something else).
Dunno, might be a passing mood. We'll see