Simple request - people ejected or banned from groups, shouldn't be notified that they have been.
Sometimes a user is being removed through no major fault, or for fault that isn't immediately occurring within the group itself. Being able to remove or ban silently is less likely to cause immediate or more volatile response. Sure, sometimes it'll still happen - but there's also good chance it'll go by unnoticed, or unnoticed enough for tension to die down.
You aren't notified when someone removes you from their friends list, or bans you from a region or parcel - so why are people still notified when they're removed from groups? If the admins wish to inform a user a reason for the eject / ban, I don't see why they can't just send an IM of their own accord.
I don't currently see good reason to keep these notifications.