Use of leve allowances?

[Naberrie]

Any gil earned through leve turn ins is not meant to be a secret.

Also, any item you get will likely either be needed for the craft you did the Leve for, so you won't want to sell it, or will be so common from others doing the same Leve that it's worthless to sell at market.

A better idea is to search and see if any Leves offer mats to save yourself time and gil. However, I've noticed such rewards are not always offered. Sometimes you have to come back later and check the Leve again.