Start a save file with a character that you are going to want to keep and three separate characters that you will not keep. Once all the characters are made, go back into the home town, Tipa, and with the three characters that you do not want to keep drop the 200 Gil that you start with, along with all items that can be dropped. Go into Tipa with the character that you do want to keep, and pick up all of the dropped items and Gil. You should earn 600 Gil each time you do this trick.