Duplicate on going?

im heard about duplicate on this week,some ppl like a boss buying most expensive item on trade chat,and some ppl selling stuff very low than normal price,just heard about duplicate mastery pin mount and patron,i think they will do more stuff.
anyone know how?

yeah but trion are making that for user ban more easy! they are checking always people selling very cheap items for ban!

do u know how to dupe?