Back in January, U2 announced the dates of their �Vertigo� world tour. I contemplated trying to purchase tickets for the May 21 gig at Madison Square Garden. I was a big U2 fan growing up, and MSG is right across the street from my apartment. I ultimately decided it wasn�t worth the steep ticket price. The tickets to the event sold out literally in seconds. As I was thinking about the show, a few things occurred to me: