Dial up uses different IP addresses each time sign on occurs...
It is possible to ban a range of IPs but what if a legitimate user is using the same IP and then can not log into the site...
There is really no way to win...the admin validation looks best though, but now it has to be checked daily for potential new users...what a frustration one user can cause. It happens the same way on the Alcyone:06 ship. One bad player makes everyone look bad ><