Lots of older bands do this. They've got fame and fortune allready, so why bother?

I saw Peter Gabriel last month in Chicago, and granted it was like his 3rd show on the tour, but he was forgetting lines, the stage was screwed up, etc. Kinda dissapointing for $95. To their credit, the band played great, even his daughter was good (I was kinda suprised), but Pete had just lost something over the years.

The same with Manson a couple years ago at a festival. He forgot what city he was in and just stopped singing a few times. Luckely he was the last act (bah) so I just left.