Call me crazy, but don't you need to 2 Fieldcraft Demimateria III's to make one of the items to trade for Talan, which will only get you 1 Fieldcraft Demimateria III, netting you a loss of 1 Fieldcraft Demimateria III per craft?

I think the idea is that people can trade their items to Talan for Demimateria IIIs now that those items are largely useless, helping you to recover a bit of the cost of them.