Dudes are horny bastards and specially people who spend most of their lives infront of computers. (They Think with their dick since they arent sexualy active)
This "thing" isnt really bound for Wow Streamers its been going on forever everywhere
Still i cant belive u havent said anything about the Cosplay industry which is basicily about the same thing. Look up Jessica Nigri and tell me what talent is behind her fame.