Crafting Leves, when compared to Fighting leves produce a lot of gil, especially the one that requires 3 item turn-ins, especially since you can repeat it 3 times, and get extra rewards for HQ synths. With 9 HQ, you can make a ton of money with a single leve allowance.

It doesn't compare to the value of the HQs on the market boards, but it certainly generates new gil to the economy.