Honestly for professions and things like that - as a multiboxer you shouldn't be looking at them to make you money, cause you can make FAR more money other ways (dailies x5, etc).

So on that note, since you're not using JC to make money (right? Right???) You can just get to 80, burn through a couple hundred quests in ice crown and storm peak and have 20k+ gold to spend to level JC and any other professions you want