Like in real life, I am sure that there is gil in circulation that someone originally bought from a gil seller and then spent. I don't think there is any merit in trying to somehow trace that gil and pull it back from every account it has somehow tainted. To me, it is the player who buys the gil who is the problem, not the player/ crafters who through selling something on the market board have received some of that ill-gotten gil. I'm talking about taking action against gil buyers, not people who receive some gil in payment for a legitimately sold item on the MB. once the gil leaves the hands of the buyer, I would consider it 'clean' since to do otherwise negatively affects innocent players.
I'll say it again, not to be a pain, and not in reply to you, but just as a general point in this topic... I don't think this can be stressed enough. Without buyers, gil sellers would have no reason to spam anyone. Therefore the most effective way to combat gil sellers is to stop people buying gil.
