Could there be, instead of the Agree button, an Exceptional Post button, one that readers push only when they feel the post is an absolute gem, useful to many, and important for everyone to read...a treasure.
Put the 'yes' voting to the people. 'No' voting is an entirely different kettle of fish, and it is the job of the Webmaster, only, to decide what he doesn't want, and what to do about it. The Alert-Bad Message button is enough.
But put the bright star award to the readers. You'll soon have all your R levels very apparent, by the number of votes each post gets, in, say, a week.
Put your moderators to compiling a summary of possible steps to try, in solving a health question.