If all you do is dungeon spam and you are running out of Gil then the problem lies with you. There are plenty of ways to earn Gil in the open world if you just put in a Liltime away from the dungeons crafting/gathering being the best one. If you look at some of the crafting loggs there are items that take two items to create the sell for a few hundred Gil to NPC vendors. I spent 1 hour yesterday crafting mytheral morters (takes 1 mytheral ingot 1mahogany log to make) and walked away with over 250k Gil not including all the HQ items Im selling in the market.