I have a hunter that I mainly use and as I've played the game more I've seen what the other classes and subclasses can do so I've started a Titan and a warlock. I've gotten exotic drops for both of these characters but they are only level 4 or 5 long ways away from being able to use exotic gear. So rather than shard these pieces I hold onto them for when I make time to level them up. So I keep armor in my vault.