During the forum transition this morning, the old forums were briefly showing ALL the forums, including ones that were normally hidden. From that I learned that there actually is a private, invitation only feedback forum with substantially higher blues participation than the regular forums all of us get to see.
My guess the reason some of the regular forums get so little blue participation is because they literally never go there, they are in the invitation-only forum. The rest of us are wasting our time but at least we get to hang with each other.