Very interesting post and one that we have also debated at length in our own CC...
Although I am not an owner, I am one of group of players in our CC affectionately known as the "Fixers" who organise our weekly and Seasonal events...
We have just have undergone a Mass Cull of players for not taking part in CC events or posting on forums. Typically we have about 100-120 active players in the CC although the capacity is 250..Current membership stands at 186 although this will soon drop to around 120...
Our weekly events (4 free strokeplay and 1 CTTH event) attract between 50-70 players most weeks although some weeks it is lower, so our % participation against the 120 active members is around 25% - 60% and our Seasonal 12 round leagues which run over 6 weeks each season attract between 40-60% participation levels based on the 120 membership we are soon to have...
We have 6 MAJORS each year (4 round 72 hole events with cuts just like the real thing) and that has drawn in around 50-60 players per round and we have a ranking list leading to an end of Season Ryder cup (England v's Rest of the World) for the top 12 players and a Walker Cup (same teams) for players in 12th -24th place on the rankings.
Our biggest problem and one we haven't resolved is getting new members onto the forum (am sure it is the same in all CC's).. That to me is a key in getting players involved as so many just don't know what is happening in the CC rightly or wrongly .So many players join and then don't want to get involved for whatever reason (you wonder why they join in the first place?). We encourage players to come and say hello and it is amazing how many still prefer to opt out of doing this..Tiz a shame as they miss out on so much..
Just recently launched a new website in the hope of getting more players involved and getting information to prospective new members. That for me is still the key without doubt.
http://ukge.weebly.com/index.html
Cheers guys
David aka Fixer 2 in the UKGE :)