Hmm... but I think it's quite justifiable. These artistes/rockstars have only one mission for their concert (ok fine maybe two if you include making money), and that's to give their audience their bang for the buck and put up a good show. We can't expect them to put up a fantastic concert if they had squalid backstage conditions can we?
Haha I remember reading one of these articles too... regarding some metal band that created a list just to make life difficult for the event organisers. They requested virgins, sheep heads, drunk homeless man covered in blood and really really wierd objects that they said were required for their rituals. Then they stated in the last page that if it was impossible to get the above mentioned items the usual backstage stuff would do.