It's all about the show. If the crowd loves it keep going. If you know they are going to pull the plug, and the crowd is really digging it, end it with a big finish and leave the crowd wanting more. They will come see you next time. People who put together the big multi band shows are good friends to keep, don't burn too many bridges or you'll be playing to yourself on an island.
And Courtney Love is little miss publicity. She sings like a dying hamster and writes like a 1st grader. She did a good job of cashing in on Kurt Cobain's death. They should've bashed her over the head with the acoustic.