I think that for some, they don't want to tell because it takes the spotlight away from themselves. It's one giant popularity contest. It has nothing to do with "respecting Satoshi's privacy". But I'm sure if you asked them personally, and if they can trust you, they'll tell you. There's also that aspect where venture capitalists don't want to be associated with the real Satoshi because of public relations and marketing, which I find ironic because they're making bank off his work and haven't paid him for any of it. They want Satoshi to be a well-spoken, well-groomed spokesperson for their business instead of the exact opposite.