Apparently in the past when he cancelled a concert he sent a personal cheque to people by way of a refund, most of them didn't cash the cheque as they had a personal cheque from him. Therefore he kept the dollar! May be nonsense but clever nonsense.
Or Nonce Sense, of course!
(,
Fri 26 Jun 2009, 10:33,
archived)
Or Nonce Sense, of course!