When will people learn that opting people in by default while pretending to be Mother Theresa out to save the world is going to backfire? If you want to offer a personalized experience that requires privacy-sensitive data gathering, give users a good reason to opt in and give them full control. Otherwise, how are you any different than spammers? If people don't opt in, then your "personalization" sucks and you need to rethink your strategy.