Moorgard has posted an explanation for one of today's update notes!

No worries! It seems it's a temporary move:

We announced in the notes for the December 9 update that NPC merchants no longer pay cash for player-crafted items. As this may be a surprising change to some players, we wanted to explain the reasons behind this decision and make clear that you will be able to sell to merchants again after we make some adjustments to the system.