Brakedown of every concert I've been to that I can think of at the moment , and what I paid for it:
Iron Maiden/Dio - $45
Trans-siberian Orchestra - $40
Aquabats/Planet Smashers - $20
Sonata Arctica - $20 both times
Children of Bodom/Trivium/Amon Amarth - $17
Dragonforce - $16
If a band charges more than $60, their taking advantage of their fans. It really should not cost that much unless there are other things invovled, maybe if its a festival, or there are 2 or 3 really good opening bands. If you have a symphony with you, it will obviously cost more as well, but not many things justify that kind of ticket price.