I decided to discontinue selling add-ons and books on Blender Market.
Sales have been declining for a while now, and I had set myself a hard minimum on the average monthly revenue, and that minimum was reached last month.
I have been active for more than 10 years on Blender Market, my Weightlifter add-on was first published in August 2014, so the decision does hurt a bit, but in the end several factors added up to this final decision: It is not just the declining income, but costs have been increasing too. Both the fees to Blender Market (which are fair, but are still increasing nevertheless), as well as the time investment in maintaining add-ons and providing support, are no longer in balance with the income.
I was never in it for the money anyway, it was just a hobby, and by doing this I hope to be able to spend more time on things I enjoy more, like creating completely free add-ons, and using Blender for my personal artwork.
I am not completely gone from Blender Market though; I like modelling too, and I will continue adding some if I think that they are good.