Yeah, I hate how seemingly random getting fake gald is. It's such a pain in the ass to get 15, let alone one. Still, the place is a great area for leveling up rapidly in a 10x experience run. The only problem is that the sidequest to unlock is available only in mid-game in a really tiny window of opportunity. It's something I dislike about the Tales series, how strict the timing to some of these subquests are. It can get quite annoying if you get wrapped up by the game to enjoy the story but then suddenly remember you were working on a sidequest, only to go back to that point you needed to be and realize, "Oop! You missed it!"
It's really tedious and annoying game design.