I don't craft. 99% of the stuff I sell is random items from the 1h ventures. sometimes it's crap, sometimes it's great.

But whatever it is I get, I want to get rid of it as fast as possible. As it didn't cost me anything to get them (paying venture tokens with seal, seals that I get from unsellable equipments from those same ventures!), I have no trouble in my mind putting them as cheap as I want, so I undercut by 1, 10 or 100k depending on the minimum price when I sell and make it a round price at the same time.

And if it happens one of the items I try to sell is going to close to NPC selling price, I just put it aside, go buy the stock of that item and sell it in Doma and profit.