I feel that this is by design. A good way to make money is with crafting and gathering skills and the leves associated with them and since they are repeatable, gil should not be a problem. This is a huge game and it seems this design element is meant for you to experience multiple aspects of it. I don't think they should change anything about this design because, for me, it doesn't seem to be a problem. I say just learn to adapt and enjoy the game for what it is.