If they don't like the group nobody is forcing them to join it. I am subscribed to a few Yahoo groups, some with everyday banter, and some that only send out information once or twice monthly. The local windsurfing group runs an average of 5-10 emails a day as to where people are meeting up to sail when the wind kicks up. Our local Hobie Fleet group has become a Vehicle for sending out a PDF version of our newsletter thus saving money for the Fleet. So they have Value.
Anyway....let people exercise thier freedom to choose and don't let them get you down.
Have a Good one,
Doug Wilkins