Making gil is almost impossible on most servers

[Shirai]

Every time I look on the market board these days I am reminded of our fail economy on Sargantas.....

And yet, I manage to make several hundred thousand gil a week with only a couple of hours work and knowing what sells well.
No, I'm not going to share my secret with you but crafting/gathering is far from useless.

Anyway, apart from repairs and teleports there is absolutely no need, at all to carry large amounts of gil around.
From that perspective, the game vomits gil at you with dailies, treasure hunts and dungeons, that alone is enough to sustain you and have gil left for other things.