That kind of impact will benefit you financially but also benefit your soul. I have worked with Easter Seals for six yrs and served as its Chairman. I can tell you that working with the disabled has been one of the most rewarding experiences of my life. Those folks have taught me lessons about life and money I could never have learned elsewhere. I sure don't blame you for not wanting to make cold calls.
People do business with people they like much more so than particular companies.
I would only add that you should only join organizations that are doing things that interest you and get truly involved and committed. The guy that joins a group an runs around tossing out his business card is not doing himself any favors. Members will see right through that garbage. If you come on because you believe in what the group is doing and have a positive impact on the organization. People will see you in a much more favorable light.