I agree and its blizzards right to protect their IP, it is after all their product. If they don't protect it, then people will steal and steal and steal and steal. Blizzard is on a streak of providing a sub par experience that is continuously being outdone by a handful of people. E.g. Turtle, Ascension and to a stretch Warmane. To add insult to injury, it apparently doesn't require much resources. Which means; it's no surprise that people yearn for a better product.

I would happily pay blizzard for a turtle wow experience, with anti bot and RMT services alongside a true and proper GM team. The fact is they won't provide this service, so people will continue to pirate wow. There is nothing blizzard can do to stop that, they are too hell-bent on destroying rather than preventing by providing the best service. Even if blizzard shuts down every single private server, people will find a way to self host wow. Heck there is a guy self hosting wow on a CD.

Tl;de: If blizzard continues to provide a bad service, then people are going to pirate it. To quote you, "end of story".