I have been digging the archives of the internet to find a dupe method Archeage. I paid a pretty penny for the method and I am going to redistribute to a limited number of people on the NA/EU. The exploit involves the mail system. (good luck if this has just set you off on an adventure)
I have years of experience here and a very high reputation account on a similar site. (can link and reply)
I will sell this 20 times for $200 each.
Best,
Beyou
*disclaimer* I can not guarantee you will not be banned. A few of my account have been banned, though, shuffling gold through F2P accounts isn't hard.