Being a sportsman like I know you are, what about some rewards for good behaviour. I like the condenser idea, but I would add a different twist to it, either these comments go automatically at the bottom of the list, or the other comments receive some incentive.. a vote is the current solution I apply to my little community. Maybe when the community grows, a whale that gives a simbolic vote or award for comments with value could make a difference.

Not sure you want people not give you a thumbs up :p (although it makes so much sense to me as well)