Better make stuff like the Hustle show up on the store at some point, Vault or no. You don't want people forever feeling like they missed out on emotes, they can't be passed around in a way that gets them to people that want them (the non Teachable, like the Hustle). Price it high enough that subscribers got a good deal. It is a good incentive.
I had meant to see if the Hustle emote was teachable or not. Yeah, it should show up in the Vault eventually.