I think some of them would be indeed. Look at the DJ Avicii, in his documentary you see only his manager worying about the gigs and the money involved. I think a good manager or agency or whatever do things in interest of the artist ,eventually it brings them the same but without a person being suffering from it or worse dying. The Stones,there some class apart , stillrocking and surviving .... if you asked me 20 years ago,I wouldnt have predicted it :) .. same for Iron Maiden..