Pro Sites Plugin

With Pro sites is it possible to not have a free level.

With the new project i'm starting there will be no free blogs offers.

There will be a starting level of $4.99 / month and 2 more levels with extra's for extra costs.

But can prosites not have a free level ?

I know i can set my levels as i want.. But I see this part

"No thank you, I will continue with a basic site for now"

So Pro Sites is telling a new sign up they can continue for free. I know i can edit this message.. But how can i stop anything relating to free from showing up ?