There are two ways to handle it. More moderation, or a simple throttle control to limit the number of posts per day. I average around 4 posts per day, but I would be happy if there was a 20 post per day limit. Or even start with a higher number to see how it works. Maybe 40 posts in a 24 hour period? I think that would be plenty. Who makes 40 useful posts per day on this board?