You should only have to pay for the accounts that are using your site so we split your accounts into qualifying accounts (paid) and non-qualifying accounts (free).
Qualifying accounts (paid):
Non-qualifying accounts (always free):
Custom membership statuses that you create within the app will be evaluated on a case-by-case basis to determine if they are active users or not. For example, often chapters will create a 'Studying Abroad' status which would be determined to be a non-qualifying account for that semester.