I don't know why but after the implementation of the quest system yesterday, I found myself oddly compelled to spend most of my free time achieving these seemingly valueless and rather difficult hunts.  I now find myself at level 13 with 9 finished sets and 51 overall quests completed.  Upon reviewing my current stats I feel both a sense of nerdy pride and utter shame of time poorly spent.  That being said, it is a great new feature and I really hope for retroactive accounting for S rank quests.