Does the world refresh from scratch, have a standing base at the start, or is there a type of MCedit-able base placed in, so that maps aren't identical?
And again, some of your users are insane. I didn't think anyone would go that far- Mass fab and all that. But at least someone isn't doing 4 64x64 quarries with the same setup. ... Or are they? The hell would they do with all those resources?! (Well, this is Minecraft. The hoarder's dream.)