Too bad, how expensive you think it would be? I'm not expecting it to be cheap, the football world cup tickets are more than US$200, I think will be something alike...
And the riots here are very common, but since 10 or more years it's on the shadowns, to not go to newspaper or the law prosecutors close the organizated supporters (firms?), etc... But from time to time there are reports of ambushes, spanks and deaths... Last game of my team had a death on a try of ambuching the other team's supporters... The face of the guy was unrecognizable...
But as everything on Brazil, isn't very serious the close of the firms, 4 or 5 years later they came back...
Anyway I'm thinking in going, I want to know New Zealand and if possible a jump to Australia too :D