I think that banning paid members is a bad idea. First of all, the same person can log in from home, then from work, then from laptop via wi-fi. If you want, you can ban these members automatically. As a result, your site's reputation will fall down, and there will be someone why may post messages on various forums and blogs that you are scam. I think that notifying these members by email about changing and not sharing their passwords is the best solution.
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