Im with Shane.
Aside from the Windforce Wed night slalom (which is awesome) there's no regular windsurf racing (slalom racing in particular) held in or near Perth. The social side of things would also be of benefit too, everyone Ive come across windsurfing has been great, no nastiness to speak of. The sailing clubs I've been associated with over the years have been great too, but not cheap to join.
Thats what would get me in.
It is, as you say a can of worms though, and it always ends up being the dedicated few that run the show