I think we should be able to trade reagents like we're able to trade treasure cards because collecting everything you need to craft something is so tedious on some items (like black pearls). Its also very disappointing to hear your friends have exactly what you need and you have to use the Bazaar as a mean of trade because you have to race whoever else is seeking out those items too.
Yes, yes, yes! I Can't tell you how many hours I spend in the Bazaar trying to buy high demand Reagents and collect rare ones from drops. KI please make this idea happen!