I think when you become a clever commentator you do can make money with this. It requires its very own strategy but is certainly a value for the platform in any way. Authors need the support and interaction of readers. If all readers never reply it would be very dissatisfying.
If you have not much to say you can still check out contests and challenges to get some more interaction and maybe win some Steem. That can be a lot of fun. There are even games where you can win. Like this: https://steemit.com/contest/@oleg326756/minnows-feeding-frenzy-season-1-winners-and-registration-for-season-2