I'm a lurker. I can't post anything meaningful because I'm not there yet. I'm slowly working through the long list of projects after making major life changes (retiring, farm changes, family health, grandkids).
I also am the owner of 21 groups ranging from 500 down to 2. I can tell you that 95% of the activities in a group are from less than 10% of the members. Everyone on the group gets what they want.