That isn't true. The bloody ticket scalpers are the ones who jack them up, thank them. U2 is pretty p/o'd about it. They charged up to $49 for their tickets, which is extremely reasonable.
Went to U2 in Seattle on April 25 and it was by FAR the most incredible concert I've ever been to. I'm going again when they play Portland. FAN-FREAKIN-TASTIC!