Alchemist is a good thing for making gil. In about an hours worth of work I put up lots of different things for sale and all of it sold in a little over an hour and I made 1.5~ mil. Much better than mining IMO since everyone and their mother does it and -most- hot items for ALC you can farm with DoW/M easily or get for cheap from NPCs. Most profitable item would be Elixers (depending on your server I would guess), on mine they go for 45k each and they sell super fast.