I understand mugs, magnets, and programs. Anything else just escapes me. As far as t-shirts, I always think of Jeanine Garofolo talking about people who wear the t-shirt of the band at the concert and saying "please don't be THAT guy." Plus, I never understood the mark-up on a t-shirt. I'd never pay 30 bucks for something I'm gonna sleep in.
I think the merch people look for the cheapest items that they can print on. I never understand the logic-some shows have nothing and some practically have a retail store. I mean, Xanadu, doesn't have a program, but they have leg-warmers and barettes. :)
"The sexual energy between the mother and son really concerns me!"-random woman behind me at Next to Normal
"I want to meet him after and bang him!"-random woman who exposed her breasts at Rock of Ages, referring to James Carpinello