one thing to note about daily turn ins, yes they give good xp especially for hq and on bonus. but if you have to chase around for mats to make each item then chances are you could of just auto crafted a stack of something and gotten the same xp in the same or less amount of time.

for turn ins if you cant easily/quickly craft your own, either go to mb see if you can buy a cheap hq or nq if not check venders for cheap nq. wasting a tonne of time collecting mats for one turn in is just not a good idea if your trying to level quickly/efficiently.

also to counter the gil aspect a little gather something you can sell for a reasonable price that moves well. then you use that gil to fund the things you actually need like crystals and the such.

your wasting gil if you only gather the things you need when you could be gathering things to sell and buy the things you need in larger quanties from the gil earned.

always be thinking about how you spend your time when levelling. getting the xp in a reasonable amount of time is what will save you and make you gil. there is no need to go broke levelling crafters/gatherers at all.