the best thing would be to use a Points system that force people to pay to play... they have to participate on your forum to gain points, and you are the one to fix a price for each game played... members have to pay X per game, so that member who is sharing his account would have to post a lot to be able to let his friends play on his account...
even if the points are used only for the arcade, it worth it sometimes... remember your bandwidth, you pay for it.
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