Restricting Premium Plugins with Pro Sites


I’m setting up a new network and running some tests of Pro Sites using the Premium Plugin module. I have certain plugins available per level. I am creating some test blogs and manually setting their Pro Site levels through the Network admin. I am noticing that even if I set the Pro Site level to the basic option, all the premium plugins are available the user. Is this just because I am manually setting the level? If a user actually goes through the payment process will they be restricted?

Thanks, Chris