Mere like a "bravo" comment would do :) Bloggers would like engagement and that brings additional earnings. There are so many sports sub-groups posts that are not being posted on sports tribe.

There are many users posting on general tribes like OCD and Gems when they don't know where to post the less structurally themed article that they have. @ctptalk is gearing up and I hope they find the right audience and the audience find them. But, you are right that it all depends on what users have to say.