Comment by chaitanya

Maybe this will strike a better balance between comment quality and participation?

* A comment by a person with karma < 1000 stays pending until endorsed

* Once 5 or so successive comments by this user have been endorsed, he/she can comment freely

* Now, if a new comment by this user gets flagged, every subsequent comment goes into pending state until 5 or so comments have been endorsed again

Of course, the numbers and the algorithm can be tweaked. But the basic idea is: reward users once a certain threshold of their comments are endorsed, and punish them if a comment gets flagged.