Why would the new ones be randomized??? Of course they wouldn't be randomized. Also, i know its a strange concept, but new people do start playing this game. I dread the day a new player tries to spam silver just to get the Enthusiastic dance or Slow Clap.
Edit: There is no logical reason save for making more money that they would put current emotes in a randomized package system. It wouldn't be difficult for them to just make another page. Kiosks are full of emblems and shaders, it wouldn't be hard for them.
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Remember how long it took them to give us multiple pages in the vault? Apparently this is a large programming hurdle for them.