Sadly like the real world there are no get rich quick schemes in WLO that work. The best way to make money is either as a syrup seller or as a manufacturer of high demand items or as an Alchemist. None of these are quick solutions for making money. If you are high enough level you can sell Quests, or have the money to spare in TRW buy Item Mall items and sell them for outrageous prices. One way that I make money is to go to Osyla with my vacuum and gather Crude Oil and Blue Stone and sell it for a fair price. But the gathering works at other places also.