“Nearly a decade after “The Producers” introduced the $480 ticket to Broadway, V.I.P. pricing has established itself in the ledgers of rock ‘n’ roll. This summer Justin Bieber fans can pay $350 to attend a pre-show soundcheck. For $800, Christina Aguilera will pose for a picture. (For $900, Eagles fans get dinner but no photo-op; most packages also include plenty of swag.)”