There have been a lot of questions about this, so I thought I'd make an official post.
First of all, I want to thank everyone who has worked so far to to help identify possible cheating. I understand trying to cheat on a game with trading because they can amass good loot and then sell it on e-bay for earth monies. But seriously, there is no good motivation for cheating on a game like this other than to ruin other people's fun. That is not cool.
The Japanese system automatically checks for cheating and drops anyone from the ranking counter if they're displaying certain behaviors (it also puts up warning flags at various levels that GMs can see). However, dropping people from the ranking doesn't stop people from trying to cheat to win treasure battles, so we are still going to have to ban occasionally.
If you suspect someone of cheating, please PM a GM immediately. You may include links to screenshots. You should try to include the Battle ID, which can be found in the chatbox. This is for PM only. In the public forums, please do not post screenshots that reveal an Iczer's name, Cemetery, or Soul Cards under any circumstance, unless you have permission. Oh, bit of advice, if posting a shot of your own glorious victory, you might want to consider blurring out your own soul cards too...
"Scissors are overpowered. Rock is fine." -Paper