IMHO WBF is the most dysfunctional forum. They have three moderators who collectively must come to a consensus on banning, pulling posts, and time outs. In spite of this, or more likely because of this, their highest profile members have left the site. Those are facts, not speculation.
Years without banning or moderation is not a success, it is a failure. Undermoderating is just as damaging to the flow of a forum as overmoderating. In this case, when moderation was ultimately required, it resulted in members leaving. To think otherwise is revisionist history.
And as mentioned, the owners are quite active on the site and one is an audio dealer, and the other formerly was. Not that this is all bad, as insiders can often bring unique insight to the forums, and in this case, it is all out in the open.
The quorum thing simply does not work for moderation, IMHO and YMMV.