Put gold into trade with another player, make sure its 1 gold, click cancel, put 1 gold in again, then increase in to 10 gold, one by one, then click cancel, them put 10 gold in trade window with a player, then click cancel, put 1 back into trade with the player and pull your connection out (Network Cord) and loose connectivity and it should dupe 10gold x2 in your inventory so each time you do this, you gain an extra 10 gold. Sure it may be tedious but it can be a simple way to make some quick cash, also change the 10 gold into whatever (1000, 100000, etc.)
i have done this many times and i have 80k right now i say it usually works about 80-85% of the time
mebe this will get me premium membership *wink wink*