You are dead on: "quite often, they're people who are divorced, divorcing, single, or have troubled relationships".
An old friend called his local group whom his W hung out with The Society of Separated Women, or SSW for short. We concluded that this is an international society with branches everywhere. We also concluded that most chapters, even thou they had Women in their official name, welcomed all relationship dysfunctional people, regardless of gender, race, creed, or sexual orientation (which can make for some very interesting developments for addle-brained, alien abducted WAS's who aren't sure they should be married, or, well, never mind for now...).
Anyway, the SSW chapters are very non-denominational and ecumenical. In my W's chapter, most members were separated or divorced women, but the the OM was a member and a few others who were married then but are now divorced. The membership is constantly in flux and ever changing. It seems that one of their main focuses is to increase their membership by recruiting newly disillusioned married people. They offer much support and encouragement to end the pain and just move on. Curiously, 3 of primary ring-leaders back then in the local chapter here are now married, engaged, or in long-term live-in relationships, and out of the active membership. Funny, that...
