Question on a membership set up for a NON multisite install

The membership plugin is obvious very feature rich, which is great but a little overwhelming. I am trying to set up a very basic membership site. This IS a single site install and IS NOT a multisite install. I want to charge my clients for my site design on a payment plan and need some level of automatic control over the site if they don't pay.

- I just want a very basic set up. If the client pays $XX a month they can operate the blog and have as many users as they want.
- If the client doesn't pay, the site creator and all users of that blog are blocked.
- The client would be set as a 'editor' or less and I would be the only administrator.

It seems to me that the payment has to be on a per user basis and I want it on a whole site basis.

Thanks