As lawyers who think of LinkedIn in terms of business development narrow down the groups to which they belong, they should consider the point raised by Bill Smith.
Bill Smith raises a good question by asking about how group membership results in being found in searches done by other members.
Membership in groups allows LinkedIn members to find members who are not direct connections in their "People Search" by keyword, and this may be a consideration as lawyers gradually leave enough LinkedIn groups to comply with the new group limit.
Simply put, is your membership in Law and Legal Open Networkers more about you meeting new desired contacts or is it about those contacts finding you!