I can't imagine spending hours sneaking around in the bushes, hoping for a glimpse of a tiny, feathered creature that isn't even in season. Now, before I get a lot of angry, spittle-flecked letters from golfers, bicyclers and birders, let me point out that I have no problem with any of these activities. They are all outstanding ways to waste time, although I would, personally, rather endure an appendectomy via tire iron than do any of them. So people enjoy a wide variety of recreational pursuits, some of them extremely childish. And since birds of a feather molt together, folks generally form associations with others who like to waste time in the same ways.
Misery loves company.
And clubs are a Good Thing. Without them it is sometimes difficult to find others who like the same things we do. Country singers, sure, but never bowlers. Some people, however, like to do a lot of different things, which makes it difficult for them to decide which club to join. And if you join several different clubs you end up spending all your money on membership dues, and don't have enough left over to participate in any of the activities.