Philly, here to help out with this, sorry if it was unclear when we stated it before.
1. You have set up recurring monthly payments for your site, therefore the members paypal account will be billed each month for use of your site.
2. Say a member wishes to quit:
A) They cancel with you and they also go to paypal and cancel, that is the proper way to do it.
B) They cancel with you and forget to cancel w/paypal. Paypal will continue to bill them for the service.
C) They cancel with Paypal and NOT you. Your system will send them reminders and suspend the account when the payment does not show up from paypal and the account expires. Your system will send them a reminder that they need to pay via paypal and so on to get access back to their account. It can do this 1 time or 1 million times depending on how you set it up in the Admin Panel to send the reminders.