Well, there aren’t enough of them. It’s not that they are being drowned out so much as they don’t exist.
So one way to fix that is to make less BB topics exist, as you said, suppress some of the BB topics that don’t get enough interest to garner even a single reply.
But another way to balance this is to make more community topics. That is, to encourage folks to create more arbitrary topics that they feel would be interesting to the BB audience. I’ve done my part, I created a new awesome topic yesterday – have you?
Be the change, and all that…!