It’s not about the 15 dollars being “too much”,
It’s about not wanting to support these cash grabbing greedy practices. Warmane WoTLK is super popular at the moment with endless queues at zero dollars. Even if they shut it down; a thousand warmanes will be launched.
They know classic realms are completely dead yet they want people to pay for discounted clones they will never ever touch anyway because nobody plays on these realms anymore. Everyone is disgusted by blizzard. People are back to pservers.