@PerryM and @SteamboatBill are in self exile as far as I know. Had falling out with previous members. Perry tried to go his own way with his own forum back when Marriott introduced DC and it had a little traction but then petered out. Last I found was that the domain no longer existed. It is possible he is here just posting under a different username.
There was
@cmh that passed away several years ago. His avatar was of John Candy.
Others come, and then go. Some stick around longer than others. Why some move on is a mystery.