I've also noticed this phenomenon. Limited faciliites seem to be the biggest cause.
There's also an element of people feeling uncomfortable with the number of new people coming into the sport. I think the increased interest is a great thing, but I know of a few clubs where the members just want to turn up and socialise with people they've known for years.
My own club has a general meeting coming up soon, and I intend to raise this very issue -- whether we should cap the membership number because of the limits of our facilities. We're OK for outdoors, but our indoor facilities are sharply limited and I've had no luck so far in finding alternative or additional facilities. Maybe waterproofs are the answer?
