You can't sell ad space to your members with Vshare, you can only sell a member package.

If you wish sell ad space, you can work with an external ad server, like Openx (free). With openx you can sell ad space in your site, and the publishers can see his statistics in real time. You can choose the hosted openx version, or download and install in your server.

I use openx, and I'm very satisfied.