Let's not be too critical, negative and judgmental. People will do what they do, knowing that most are takers. What is suggested is a more positive reinforcement and motivation to do the right thing while enjoying at the same time the subtle rewards that result in said doing so.
Say, i'm seeing a lot of viewers and very few posters, for instance, J Fusco's most excellent painting got 46 viewers and about 4 comments. What's THAT about? This is supposed to be a tit for tat sort of thing. You give as good as you get. You have an opinion, don't you? Are you an artist? Of any sort? Don't be shy! Add your 2cents to the mix. You might say what someone is waiting to hear. Or needs to hear. I'm thinking, for instance, that some would like to respond to this by saying "Shut up!". Please! Feel free. Speak!