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I didn't really consider this one to be an 'exploit' (you were essentially converting mithrils to Ectos), but ANet thought it was and perma. banned players.
To ANet's credit, they are now issuing a full refund if you were perma. banned.
Interesting and surprising but good on ya, ANet.
Informing people about your thoughts and impressions is not a review, it's a blog.