Heroic people take risks to themselves to help others. There's nothing heroic about accepting $5 million to go out and run around chasing a ball, although you may show fortitude or those other qualities while you do it.
It would certainly be interesting to know what the CIA knew about Oswald six weeks before the assassination, but the contents of this particular message never reached the Warren Commission and remain a complete mystery.
I wouldn't want to criticise someone like Charlotte Church because she has done fantastically well, but personally I've always cared about the long term.