Another possibility to bare in mind is password trading amongst seemilngly good members. It's not uncommon for a member who has joined your site many times and appears good on paper, to actually trade passwords with others in order to get access to more member areas of their interest.
We catch quite a few each month doing this and they always have a good number of various website passwords that they want to trade for others. One client had a member who had been joining many of their programs different websites since 2006 and there he was, trading his passwords throughout that whole time for others that he wanted. You only need one of those guys to trade with the wrong person.
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