That is why I have indicated the aspects of a social user and categorized them at the beginning of the post. So far people are guided primarily by monetary motivation. That is why the engagement is missing. Because they see reward by investing time & effort in posts more than in a comment, that is also the reason some of the curators have taken initiatives to make the engagement better. I hope, in time, it will get better as we become more and more mainstream.
More number of people in community also bring natural intersection and engagement better. But in a monetized community, its still a complex task as long as the reward is the primary motivation.