1 - if they're both your accounts, you won't get banned
2 - as a buyer, you almost certainly won't get banned
3 - as a seller, LT's comments are applicable but overkill imo. use high leveled accounts, use old accounts, don't stake it over unless you both have very comparable accounts, and if you do, have the seller put up a stake as well (which is generally hard to agree to i would imagine), don't trade in lumby (maybe this is ME being paranoid?

), and obviously be prepared to lose whatever account you're rwting on