For a league that people dont know each other that is pretty normal. What you can do as a commish is setup a weekly poll, and see if you get any attention that way. Another thing that kinda works in getting some interest is having a weekly article that talks about last weeks games and/ or the upcoming matchups. Lastly if you dont have time for a weekly article you can have a "Weekly Pick" article were you rate every league matchup and give an over/under (your take of who the favorite might be). A must in these articles is to add some humor, so be prepared to eat crow when you get some of your predictions wrong. Before you know it people will start looking forward to those silly article and give your league an edge. All those little things add personality to the league and owners become more attached and call it home.
Feel like you are selling a product, and add a little spice to it. The rest will follow