They have frequent fun stuff along with the organization itself being interesting to be a part of. Jaycees, I've found, are consistently just the most interesting people to hang around with that I know of. But, I consider that dues paid for learning to not trust people just because they're in important positions. You live and learn. I still love the organization, but my sense of justice has had a hard time dealing with people who are deliberately deceitful.
Every group has some bad apples.
Over the past couple of years, I've been involved in church stuff via a couple of groups, including CAST, a Catholic singles group that's a pretty fun bunch o' folk. I've also been in Toastmasters for about 3 years, and it's helped my public speaking a lot. I anticipated that. I had a salaried job and working on the house was a second job, available any time I had the time. I did learn plumbing, though.