So how exactly are they not valuable?
Remember, we're talking about just "hiding" them in some way, from Anonymous Monk only. To logged-in users like Your Mother, they will appear as normal -- unless the monk takes some measures personally, e.g. via css, to alter that.
So in answer to your question, this would be essentially a new form of Moderation: Nodes which the community has deemed to be egregiously bad will be hidden from Anonymous Monk, and whoever else doesn't want to see them. More or less exactly how current moderation works with "approval": unapproved root posts are not visible to Anonymous Monks via the usual lists. (They're not hidden entirely; they can still be viewed directly, for example, or found via searching.)
I reckon we are the only monastery ever to have a dungeon stuffed with 16,