Typically the best way to quickly get gold is by selling your items to the blacksmith. However, do not sell the items before disassembling them. View some of items at the blacksmith for pricing. For example, an exotic sword may sell for 3,000 gold, but if you first disassemble it you will get 4-5 different ingredients that can be worth close to 10,000 gold. Thus, first disassemble items and then sell the materials to the blacksmith to get more gold.