They invite streamers for free advertising but they also invite streamers because Beta has a limited amount of players that they can invite. It allows everyone to be able to see the content of the Beta without having the server load along with it.

Second, "Asmontwat" was a Grand Marshal of vanilla, probably one of the signature most no life classic-like thing you could do back then. Most of the classiccast people have played private servers and raided up to Naxx including actually playing back in original WoW. Explain how they have no idea what they're talking about because I guarantee from what you are saying, they know a lot more than you.