Since this is basically a game you're making, you should design it so it has a little more meat on its bones. More content, something more than levelling a simple combat skill and buying better weapons. Dungeons? Server wide events? Even if you're early in development doesn't mean you don't need to design and think about future features.
Well, maybe you already planned these but didn't post it/i missed it. But no one will play this/buy extra character slots if there isn't much content.
Poll