You drastically over estimate how hard platinum and items are to track down when you are running and in control of all of that data that enters and leaves the server you are running. It takes time, but it is in no way impossible or a barrier to stopping RMT from major buyers and suppliers, hence why every 6 months or so they ban 20-30 people.
Now, are there people that are overlooked. On purpose, otherwise? Possible.
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