1 million views worldwide is pretty niche in the grand scale of things. You would need growth on a massive scale before HBO is going to consider airing them.
Nearly all their content is UGC gaming + parodies around that. Shockingly big market (shocking to a non-gamer like me). Twitch has a big opportunity.
2.25 billion monthly views.
EDIT: I was trying to find it and found references to the show Cinematech although I'm fairly sure I watched a full playthough of Hitman and most of the cutscenes from Far Cry instead of just trailers over the course of 30min.