Why is there a limit on how many groups I can be an administrator of?
Administrating a group is fun, but it requires a commitment. A group relies heavily on the function of the administrators to approve deviations, post blogs, invite and vote on new members, etc. and keep a group from going into decay. The community told us that given the large responsibility of administration, administrators will appreciate having a three-group limit so they don't over commit themselves. For those admins who have enough time and resources admin more than three groups, they have the option to admin up to ten groups if they have a Core Membership.