What Shady said is very true. Even if all your crafter classes are 70 if you find you need something that the moogles give out youll have the option to do more quests for them and get what you need. And you probly already know this, but the Ixali tribe offer crafting quests in the 1-50 range if you need help getting any classes into the moogle set(theres another crafting tribe in SB for 60-70 too - the namazu).