For me it is more related to trying to find a community that you fit well in, and can relate well with on many levels. i.e. listen to similar music, like similar movies, have similar social schedules, taste in clothing, etc. Lots of stuff that is frivolous on the surface, but really does contribute to kinship. In addition to that - talking about the social issues that affect us more than they might those with children, or have survived the vietnam war.
It adds to the comfort of something that can be very confusing to some. Feeling like you don't fit in at poly meetings can be a hindrance to even going. I know I have felt that way. I'd like to find a group that is more my "style" so to speak.