I think we'll have to agree to disagree on this issue BDW.
I see that there is a massive irony in protesting about war and poverty as a multi-millionaire musician, but to have it any other way means establishing some arbitrary cutoff point, a level of success beyond which a view about the world is deemed irrelvavent by virtue of a level of fiancial comfort and security. This surely cannot be right? John Lennon was already obscenely wealthy when he wrote and sang 'Working Class Hero' - is its validity as a message, and the power with which he delivered it any less because of that? I don't think so.
A social concience is an attitude of mind, and it is not diluted by success, money, or indeed lack of either. Humanity doesn't recognise pound signs. And amen to that.