From Playonline.com:
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 6,860 PlayOnline accounts were terminated while around 990 accounts were temporarily suspended.
Additionally, we have increased the number of mass bannings against certain PlayOnline violations in order to prevent illegal acts.
Details of the violations are as follows:
The termination of these accounts has led to the removal of approximately 4.1 billion gil from circulation.
We would like to remind players that as well as adversely affecting game balance, the use of third-party tools or cheats can also have consequences that are not immediately obvious, such as introducing damaging viruses, and comprising the security of private account details. Usage of third-party tools will not be tolerated within FINAL FANTASY XI, and we will continue to severely penalize any players found to be in violation of the PlayOnline Member Agreement.
As we continue to ensure a fun and balanced environment for FINAL FANTASY XI, we hope that our players enjoy the game as it was intended and take care to avoid involvement in activities that violate the PlayOnline Member Agreement.
Thank you for your continued cooperation and understanding.