The only thing I use gil is cheep supplies, teleports and repairing gear. Other than that if I feel like the supplies are going for a to much, I farm it and keep the NQ and sell the HQ to still make profit. But most of the time, by the time I get back the price dropped so much I fell like I just wasted my time because people try to get a quick sale buy price matching off each other so items that cost 10k per pop are now 500 gil or lower with in a day or two. They really need to go back to the FFXI auction house ways again to help balance out the game a bit. I know its easy to monopolize the market but hay some times that good thing. If you are into making gil off the people that are monopolizing its a good way to go. That's how I made most of my gil in XI. If they don't fix the basics of the game many people are going to leave because they are bored with it quick and mad because the fell like they wasted their time on their crafting or gathering jobs.