SquareEnix, the company behind Final Fantsay XI, has announced that they have recently banned or suspended 7,900 accounts for various infractions against the user agreement. They have also released a report from their Special Task Force on the issue:
"We would like to report the termination today of multiple accounts held by players involved in the usage of third-party tools or cheats, or engaged in RMT (Real Money Trading) activities.
Based on the results of our investigation, around 6,750 PlayOnline accounts were terminated while around 1,150 accounts were temporarily suspended.
Additionally, we have increased the number of mass bannings against certain PlayOnline violations in order to prevent illegal acts."