The measure of a good community forum should be to offer a diverse mixture of people, subjects and opinions. Bud & Marcelyn have done a fine job of creating a wide ranging site allowing a multitude of topics and participants.
There are already plenty of metrics to categorize us (Expert, Advanced, Member, Novice, Newbie) and each of us are clearly tattooed with posting numbers.
I should have a right to flag people with inordinate participation just like you can judge me for only nominal reviews.
Putting every entry through a "useful/helpful" filter will only lead to confining moderation, something which Lee invariably avoided.
A free exchange of viewpoints should be preferable to a mutual admiration clique.