That's a very high wage bill when most of the mods are volunteers.
Where is the money going? I doubt very much that Justine and co are on the brink of losing their homes, lost their jobs, struggling to get food, on the bones of their arses financially.
The moderation is quite hit and miss. There are certain things/people we are unable to talk about, Jack Malone for example. Paying for that kind of censorship seems wrong.
Since the threads on here are lifted so much for the tabloids why don't you get them to put their hands in their pockets?
If mumsnet had asked for donations then that would be different, but to create a 2 tier user level just seems very wrong.