"The young people are going to have to start asking themselves what kind of world they are going to leave behind for me and Keith Richards."

~Signed,
Willie Nelson

If you can get tens or hundreds of thousands of dollars for an hour and a half of playing the same music you've been playing for 30-40 years, why would you NOT want to do that?

Personally, I think it has more to do with playing in front of an adoring audience than anything else.

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Aries
~Sign of the Rams