Hrm, well, I guess some of us could consider gambling unethical - let's ban all the casinos and people who use them. So is knowingly selling items for far more than their worth, let's ban those people too. Both of those things could conform to the requirements of "unethical" and "for personal gain". See how using a vague catch-all type of rule as justification works?
The lesson to be learned here is not "how can I game the rules" but "maybe if I didn't act like such a bag of dicks on the forums 24/7, people wouldn't hate me in game."
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