Well, this is complete bullspit. If your concert isn't viable without Aerosmith there then the concert organizers need to go back to the drawing board and come up with a different format or maybe there needs to be different organizers.
You can't hold a wrestling tournament and cross your fingers that a certain team will show up every year and be mad at them when they don't, even though you don't say squat when other teams don't show up. Maybe the anger should have been directed at other teams fans for not supporting their team rather than Iowa fans for supporting theirs.
Does Aerosmith play at every concert held in the Boston area? I doubt it.