Whatever the truth might be about Ozzfest, System of a Down should charge whatever they feel like charging. One is free to go or not to go.My guess is Ozzfest promoters make a pretty penny too.That's not to say that bands should fleece their fans, but if the fans want to be fleeced...This obviously does not enter into the very real class dimension.Two mitigating actions come to mind:1) maximum ticket price - Fugazi would only play shows where there was a maximum price level.2) occasional free concerts - Aterciopelados do an annual concert in the park.