I'm interested as to why you think that's the case. There's nothing wrong with people lurking and simply sharing posts, not everybody has to be a contributor on the site. If somebody wants to enjoy the submissions and conversations by lurking I see nothing wrong with that.The last thing hubski needs is lurkers.
swedishbadgergirl and humanodon -check out this lurker roll call post from a while back. Interesting stuff. I for one love the lurkers. I create a lot of original content on Hubski and I'm glad to know that there are people, phantom beings, out there in the aether hopefully enjoying it. My favorite is when I see a post with some shares and click to see who has shared it and there's a user that is 200+ days old that shared it but has never commented. It takes all types.
I see nothing wrong with lurking either and lurkers are better than no users but I think it's wrong to encourage someone who is posting to lurk.