and Barbara is wondering whether we have properly considered the cost to the secretariat of running the mailing lists, and whether we should have a slightly higher bar for creating them.
Fair enough. Perhaps we could get a list of all the ietf hosted mailing lists, remove those that are WG lists and see what remains? That would allow us to see if/how big the problem is and if some sort of house cleaning is appropriate (I'm sure we've never done any...)
I'd be _very_ surprised if we were to find that non-WG lists were contributing significantly to overall mail load at ietf.org.