I love how everyone says there is nothing to do with gil as if they have too much, or there is not enough gil in game aka economy crash.

I also like how people do not understand that gil is for convenience. Someone else has gone through the effort of creating/farming to craft gear. Spend your gil on this to gear a second class/job. Or you could buy the HQ mats and use them for crafting turn ins. Or you can buy mats and level you crafting off them. There is a ton of things to spend gil on that isn't frivolous.

TLDR: If you don't see use in gil, you're doing it wrong. and dumb.