Comment 7 for bug 558006

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The problem with the NAH approach is that every time a
member leaves the list, the administrator needs to generate
and distribute a new key, and every remaining member would
have to remove the old list key and replace it with the new
one. This could become a logistical nightmare, and makes it
more difficult to sell this capability to a group that has
people who are email savvy, but not necessarily pgp-savvy.

I prefer the approach in patch #645297, recognizing that the
task there is to maintain strict security of the server and
the secret keys of the lists.