Gathering Quests

So is there any point in turning in the last gathering quest?
For example: Mining finishes with Blue Iron. If I have the quest, I can mine the mineral, and if I turn in the quest, I lose a piece of Blue Iron for... what? What gain is there other than quest xp? Is there any?

Thanks

At this moment, no. There is a revamp of the whole system later on, hopefully it will make more sense then :)

If I understand it correctly and if what has been said in the past still holds true, you might want to turn in the final quest as you will be given the final rank of gathering by doing so. In doing that, you'll (supposedly) be given some advantage with the craft revamp to come, because crafters will be given crafting and gathering abilities based on their rank when it goes live.

Always subject to change, of course.