I don't really get why people would even be up in arms about this. If Andrew WK wants to show up, he will. If he doesn't want to, he won't. If we can make it seem like a good idea, what's the harm? Is the festival tainted because of his presence or something? You'd think if he were like, way not into this style of Metal he'd be like "thanks but nah."
If he does and you're not a fan? How about let those of us who are enjoy it, and take your negativity to another party?