I am not in s2M team, I am freelancer, do paid support, include with WP and s2M. Will try to answer short (sorry, my time is limited, thus I understand you).
@John Burton: You need to set one paid level (level1) for those who pay to see full bio. Then set the bio to be seen from everyone. Then set some portion of bio to be seen by Level1 only (depends of how you save bio’s and how you determine what to show to all).
@nayem kabir: Can not show easy answer, you task is more complicated, I need to ask questions first. But at glance: you must set a Paypal “buy now” button (create it in s2M admin) to save ccaps. Let ccap be like “m_XXXX”, where “m_” is a label, “XXXX” is the username or ID of the client, who is “master” for this user. Then you must build a function to check (by label and ID) if this ccap is allowed to read certain directory, see details at http://krumch.com/2012/09/03/s2member-hack-custom-ccaps/. Then can use that function together with SecureFileBrowser to check if it is allowed, and use s2M’s square brackets conditions to show files or message “you are not allowed”.