I can't believe Satoshi is one person. I think it's a group of 2-5-10 people. But not one. Hide 1 million bitcoins is not so easy, even for a group of people.
And in General, to understand why he (they) are hiding simply. As soon as a truthful signal about the location of the real Satoshi, in the place immediately came the police and security services. How many times the media wrote about it. Who needs that kind of publicity? Maybe he's even her. Or a group of women)