> > Perhaps the next update to LISTSERV could include notifying owners when
> > they have a subscriber who has subscribed to an unusually large number of
> > lists (say more than 20)?
>
> I subscribe to more than 20 lists on our own server, list.nih.gov.
> In fact, I probably own more than 20 lists there.
 
Yes, but I'll bet you didn't set them all up in one day!  There needs
to be a time element to this check as well.