You're attributing the motives of "fame and glory" to shooters like the ones at Columbine and Aurora, but you may be putting words into their mouths. We don't know much about the "why" of Aurora yet, and I don't remember Kliebold (sp?) and Harris leaving behind notes as to why they did what they did.
Regardless, no sane shooter is going to do something like that solely for the "fame and glory". They're screwed in the head, so even trying to attribute motive is dicey at best.