The complaint department is working as designed. It's description: "File all complaints here." It does not say that complaints will be responded to.
Given the theory behind RSP (keeping a certain type of content out of the main forums) I think it's safe to assume that the complaint forum was created with a similar idea in mind. This is a dumping ground where threads can be moved
, or ideally started in initially, to keep complaints out of the main forums.
That is exactly how it was.
And then people started subscribing to the forum.
And then, because it slowly started to be known (the sub-forum's creation was not announced, nor was its existence publicised beyond being listed at the bottom of the forums), people began posting threads directly here. And now it has its very own sub-culture.
An optimistic interpretation of that policy is that concerned parties, and those responsible for resolving issues, have a central area to discuss and solve site issues. A more pessimistic interpretation of the policy might be that it's a place to sweep those issues under the rug where most people won't see them.
Again, that's exactly the idea - to keep malcontent out of sight. It isn't so much about ignoring issues (you can always geek-mail the admins directly, and they seem generally to give real consideration to whatever it may be) as minimising disruption of the site in the same way as getting explosive RSP posts into quarantine and out of the main forums.