I also read that Joan Baez gave away a lot to causes and performed free many times. She said she could have been fabulously wealthy if she had wanted to go "commercial".At the time, money wasn't that big an issue with her and actually caused her some confusion. In later years she probablly wished she had taken money more serioulsy. She decribed a reunion concert I think at Gerdes' Folk City where Tom Rush had to send plane fare for her and Mimi Farina so they could attend. Joni Mitchell made a lot of money but largely from her songwriting and publishing. She wisely kept control of all her music. She lost the chance to be in the movie Alice's Restraunt because the producers wanted the rights to the song she was going to sing in it and she refused. She was a smart businesswoman.