I help run a club, based in west Kent. We have had maybe 40 members come through in the past 2 years, and have maybe 25 members currently.
The club has been moderately successful in keeping people playing, and providing new players with a base and range of club events and training days where they can, "Just play paintball" - as cheaply as possible, in a friendly, 'ego free' environment.
We don't charge subs, as it is hard enough for people to play as it is, and we don't want to jeopardise our credibility by appearing to be benefitting financially from the club.
The positives are that people really do enjoy playing the game. The only thing that has ever spoilt one of our days in 2 years has been the weather ! And it is a rare thing when somebody has had a bad impression at the end of the day.
The negatives are struggling to keep a range of players happy, from guys who are now attempting to play at a higher level (higher divs of Southern Masters and NSPL), alongside completely new players coming along with their Tippmans. Currently, I am not sure this is going to be possible and something within the club may have to give, ... As an example, we have so far limited the club to semi only, 280fps (which is easier on the bruises when shooting cheap, hard paint).
Also, Supair fields are a pain in the arse, with the required travel, storage, cleaning and putting up / taking down. Supair fields setup in the open are also a lot more succeptible to the weather, which is something else that may of been over looked. When we used to play in the woods, you could have light wind and rain and not really know it - it certainly did not effect the day. These days, anything other than the slightest breeze can be a bloody disaster, and likewise with the rain. These are also (maybe minor) factors that may prevent people from continuing with the sport.
I love Supair and I am quite happy playing ramping. But I think both of these advancements have killed the growth in our sport. Everybody loves the spectacle of it - all the players that quit still love the idea of it - they just don't want to stand out in the wind and rain all day, for under 10mins game time, at £80 per tourny. And at the moment we are not being shown anything else.