I was born into an upper middle class family in the Chicago suburbs with no private club associations. Now an active professional, my colleagues have encouraged me to join a specific private club in Chicago. Though I know many members, and some of my professional colleagues belong there, I feel like an outsider. Their parents, and many of their grandparents were members. There are numerous advantages professionally to being a member and many of the real estate and related upwardly mobile Chicagoans belong there. I'd like to get a check on SF of the importance of private clubs in your respective professional lives, pros & cons, etc. Thanks.