Seeing that a few materials that were particularly rare and in short stock were going for particularly low prices, I figured I'd buy out the stocks and resell some of them at higher, but understandable, prices, and see what happens.
Within twelve hours, despite the only source materials being at high prices, they've all plummeted down to mostly nothing again.
Shadow steel (5 star): 8000 to 1500
Silverweave (5 star): 5000 to 2000
Blighted bone (4 star): 750 to 150
I guess materials will always be pretty much worthless, a bunch of kids with no regard for profit, let alone breaking even, can't run an auction house.
Oh well. Was an interesting use of 15,000 crowns, I'll give it that.
Those materials are common, people got tons of those in their inventories just sitting around and can always get more by doing runs. What you see on the market is only a small fraction of the actual amount of those materials out there.