Maybe I'm missing something, but since when have we been paying for bandwidth, server space, and admin time that we can demand a full accounting? From what I understand, this list is owned by the wikimedia foundation, which has given liberal leeway to its users to join, post, and moderate the list. However, liberal leeway and carte blanche are completely different things.
List admins have been given the duty to ensure that the e-mail list runs as smoothly as possible; which they have done in the main. They are not necessarily arbiters of equity or democracy; that is not their function.
If someone, such as Marc, has a specific issue with the list, I am certain that a request may be made to the wikimedia foundation, likely the legal department.
Furthermore, the privacy concerns raised by asking for a list of moderated members are rather substantial.
Remember, even as community members, we are still guests.
--Avi