I'm a member of a group but I'm pretty sure we don't have anyone that extreme.
A number of people can set winmx to zero uploads so that anyone wanting a file must be started manually. I feel this is detrimental to the community and tell these people just that.
Their justification is that it stops leeches, sure but at what cost?
I think if you get one of these messages, if you can find the chatroom containing this group and make the admins of the group aware of the behaviour, they will take steps to stamp it out.