JC will sell for tons, and if you take the time to read shodokans post about JC and buying mats / crafting ect you will understand why he uses so many jc's. Theres alot to get with the gem's and if you have *ALL* the patterns you never miss someone wtb anything.

Just make sure if you level multiple jc's you have a plan like one guy gets caster gems, one guy gets melee, or do colors =p.