The issue is that a crafting ingredient can only be gathered in a dungeon that hardly anybody queues for anymore. Yes, this is a problem for people who don't have access to an FC airship or people who have access to an FC airship. This forces people like you to either buy from the market board or make new friends.

However, you must realize that 3.3 patch is new and that Diadem is the last thing anybody is trying to do right now. There is a ton of patch content people rather queue for and it will remain this way until at least a few weeks when most people have done what they wanted.