I do get it, and yes, I would be disappointed if I were in your place.
And given that you seem entirely convinced that none of the bands that are still TBA will be relevant to your interests, I would at this stage stop shedding your manly man-tears on the internet and either a) sell your ticket, and cancel your flight and hotel or b) deal with it. Or, y'know, c) just wait for the rest of the lineup, maybe you're in for a pleasant surprise.
Yes, actually. You spend money for something that you've not got the full details of, you're taking a risk.
And since arguing on the internet is like the special olympics, I'll leave you all to it now. To end this with a quote:
...basically if you're robbing a man and you're only carrying blanks and you allow your gun to be taken off you and you allow yourself to be shot in the eye with a blank which I assume that the person has to get quite close to you then, yeah really it's all your fault for being such a poof, so why don't you stop wingeing and cheer the fuck up.
I don't think you're in the position to tell ANYBODY to shut up. And at least unknownone has proof for what he is saying.