There's already big signalling benefits to voting. I think it explains why most people do it. However, it feels dirty for me to do something out of concern for my image, so I abstain.

Back when Elinor Ostrom won the Nobel prize, I remember reading a summary of her work that says self-management of the commons is possible when communities are a certain size. I forget the magic number, but I think it was something like 120,000.