The draft policy entitled Draft Fee Policy for Legal Requests can be found
at: <http://iaoc.ietf.org/policyandprocedures.html>
It seems fine to me, but I would add an hourly rate for research.
For requests for e-mail, do they typically provide pointers to the
specific archive entries, or do they ask for all mail from A on topic
B in month M? In the latter case, a suitable hourly research fee
would likely persuade many lawyers to tell an associate to learn how
to use grep.
R's,
John
PS: Yes, I know it's volunteers. The revenue would go into the cookies fund.