I believe the problem may be that "freelancing", in general, is seen as a secondary aspect of any profession. Questions asked here could possibly be asked on StackOverflow if they are related to development, or on GraphicDesign.se if they are related to design, or HomeImprovement.se if they are related to construction, or English.se if related to writing, or Law.se for "threatening to sue" questions, etc.
The scope of what this site is about is really ambiguous. There's no clear definition as to what is or is not acceptable. I mean, most of the questions here relate to legal issues, immigration, filing taxes, or very subjective and specific client interactions. There's not a whole lot related to ongoing freelancing. Mostly because once you have it figured out, it somewhat becomes wash, rinse, repeat to a great degree. So, most of the truly freelancing focused questions were answered 2 or 3 years ago...
I believe most asking new questions are "drive by" users. Many from other stacks, few actually stick around. Either because they get an answer and that's all they are concerned with, or they ask a question which can't really be answered.
I haven't looked at any stats though, this is merely my gut impression. I am generalizing considerably. I know there are some great questions here, but those seem to occur at a rate that is far, far, far too low to sustain this stack.
So... the "regulars" here pretty much amount to myself (who has ZERO interest in moderating), one or two other users, and the current moderators. Other than this small handful of users no one has vested much time here. And if one does not visit a stack regularly, I can certainly understand how moderating may seem like a position they shouldn't even attempt due to an already exiting lack of commitment/interest to the stack.
The only reason I even visit this site is that I pass through on my way to other stacks, just in case there's anything of interest. There almost never is.
To be frank, I'm actually very surprised this site is still active. It's been roughly 4 years. Still in beta and questions trickle in at the same rate, and are generally either an overall duplicate, or so specifically situational all one can do is give subjective advice, not any real answer.
I've invested, what I feel, is a lot into this site. As much as it disappoints me to post this, I think it may be time to call the beta failed. But that is merely my opinion.