People seem to think there's this cheater's cartel that sets price for illicitly obtained goods, so despite the fact that you can dupe items according to some guys, this said cartel is keeping price from dropping immediately. If I can craft stuff without mats, I'll put some Vanya Silks for 10K just because I can. The usual method of buying up cheap supplies is ineffective, because I can craft an infinite number of those items if I can dupe my mats, so I'll happily keep on crank out more Vanya Silk at 10K and see how long the said cartel is going to keep buying those up in an effort to control the price against my infinite supply.