When the old site owner was in charge of the place a few nasty moderators (potentially undercover agents from the other site) managed to weasel their way in to the upper echelons of power which resulted in forum members getting "banned" left right and centre; some even banned for spelling and grammar mistakes.
The new site owner overturned a lot of the "bans" (myself included; being previously banned for "life") but i'm suspecting that a percentage of long term members have left the site, never to return.
Fortunately this site seems to be attracting new members in ever increasing quantity as well as members who have become disillusioned at the politics on the other site.