If this has been posted before, please let me know. Basically this is a variation of the turtlemount scam. Use your main or an alt (whatever you prefer, however successrate will be higher with your main) and say in trade "WTS gamecard key 100-300g", some kiddy without credit card will probably be very eager to buy it. Make him give you the gold and make him confident that you will give him the key afterwards. After you have got the gold, run off ^^
Good luck, I've made some money by doing this on my lowlevel hunter, but you gotta be lucky and make sure you gain your victim's trust
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