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Some years ago I wrote my own script which logs all logins and IP's, and when some username is used by 5 different IP's in the last 24 hours, it was suspended temporarily.
I also worked on a script which detects excessive login retries and then blocks the IP of the attacker. Password sites usually use brute force attack.
There's this strange thing about password sites... Once we noticed there had been thousands of logins using the same usernames for several days (there were no scripts then), and our sales tripled, it is strange, why would people sign up when tere's a free password to use?
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