I see both reasons why Jobs should and shouldn't have their own EXP growth thingy.

I can't decide which side I want to be with, so I'm just sticking down the middle road where I level the req'd class to 30 to unlock it, and then work my way up to 50 after I unlock. Yay!

Then again, I'm also just a little too lazy to get another class to 50 right now.