Square's current methods of combating RMT are ineffective because reporting RMT is too inconvenient for players and taking action is too time consuming for Square. By providing the player community the right tools to fight RMT, the problem could be virtually eliminated overnight.
1. Create an option in the chat window to "report," right next to the option to "blacklist." The system then automatically imports all pertinent data with the report.
2. Once an account has received a certain number of reports, it will automatically be frozen by the system. To unfreeze an account, the player would have to contact Square.
The beauty of allowing the community to self-police RMT is that it is inherently a smart system, unlike restrictions or filters on tells and player searches.
If this were implemented, every RMT spammer in Eorzea would have their accounts frozen within 5 minutes, and every new account they start spamming from would be frozen in seconds.