Here is my 2 cents.

I do not believe Satoshi ever conceived that this experiment would become this successful and that bitcoins would become this valuable. I think he only mined coins in the beginning to get things going and he most probably lost most of the private keys for those mined coins.
Remember, back then most of these coins was virtually worthless, so throwing them around and playing with them was not a big deal. Just imagine if Satoshi has to emerge now and admit that he lost all of the private keys for those coins that was mined in the early days.

A funny theory

Hope you are right and we can consider that 900k BTC are removed from total supply.
It will be a disaster for BTC price if these Bitcoins will be transferred to exchanges and sold!
Then it will be better for every of us if everything will remain at same places.
Those addresses are being watched like a hawk, because people know if Satoshi touch one single bitcoin in any of these
addresses, then that might trigger a "panic" reaction from hoarders. A million coins will crash the markets and it will also
mean that Satoshi has access to those coins. (Most people accepted that those coins are lost and would never go into
circulation again.) I just want some kind of confirmation that those coins are not going to be a weapon in the future.
