My experience has been a mix so far with my zodiac, I unlocked the sub-quest for Aurum vale when I first started the grind and i'm now only one dungeon off completing everything but that one. (which still means two more after Aurum vale of course).

In total I would say i've run Aurum vale about 12 times while queueing for others simluatenously. The lack of drop chance hasn't concerned me too greatly because for the most part, you can blitz through the level 50 dungeons in no time at all, however as someone put it earlier, one Aurum vale could see you in there for around 3-4 times as long depending on your party and that's what is killing the motivation for me.

I have to give commends to those that are game enough to go for another relic, lol.