Expert Advice on Pro Sites Plugin

I am new to multi site and everything has been running really smooth but I seem to be stuck on something simple with Pro Sites plugin. I am trying to set it up so that a new client could visit my site and purchase a theme/design package I also set up domain mapping so that they can choose a url for the site they want to create… Anyways with Pro Sites plugin it only shows prices and a check out option if they are already a member. It doesnt make sense because a new client visiting my site would not already be a member and therefore would never see the check out or prices. I feel like I am doing something very basic wrong here. Thanks for any advice.