Is it possible that you insert Traffic-Accounting in Mailman ?
Don't know, but I think it's not so difficult, Mailman has to do something
like "(MailSize) * (actually members of the list)", stored in a
PLAIN-textfile, so it will also be possible to parse the total traffic,
monthly oder daily traffic.
So it will be possible, that the MailMan-big-boss-guru can have a look on
Mailman-Traffic.... later on it could also be Moderator-Role.
Is it possible to insert something like this ?