I've been a promoter. Some of the prices quoted are probably close. You are not going to book Aerosmith for less than a million dollars. Or the Rolling Stones. They do huge productions and they are mega established stars with big catalog of hits. On the other hand, you can get Pat Travers or Rick Derringer for 5 grand or less a night, depends if they are playing in your area. And they're great performers. Black Sabbath, a 100K? Way under.