I'm neither jealous nor envious of other folk getting paid more than me whether it's a paid gig or a free one. I give my time and money when and where I want, and if I'm having a good time playing, and giving a good time to others, that's fine by me. For charity or not, I (and the band I have been playing in for the last decade or so...) neither want nor expect to be paid, whatever the event. It's just our way of thinking, that's all. Others do things differently, and that's fine too. Peace.