I've been looking for a hack like this for ages, to bad I didn't see it till now.
I have a neat suggestion for
a better hack.

Allow moderators and admins to use a comment syntax, that would allow all text after // or between the /* */ to be invisible but only visible to moderators and admins. This would be more helpful, because if an admin/moderator wanted to edit someones post putting comments inside of it, they could! Or if an admin/moderator wanted to mock somebody's post by filling it with comments throughout, they could!
How about it Firefly, pweeease