My theory was that Satoshi was a group of activists who understood that creating a new form of currency and stamping their names on it would lead to controversy (See: XRP) and thus put Bitcoin's growth in jeopardy. Despite knowing that Satoshi has a large amount of Bitcoin that has since been unmoved, I speculate that originally the funds were meant as a savings account if Bitcoin were to ever grow. However, once Bitcoin started to pick up momentum, Satoshi realized how many eyes were on the account and thus kept the Bitcoins unmoved to avoid drawing attention. I imagine the Satoshi team is still out there. No longer as developers for Bitcoin but as silent eyes watching the world figure out how to utilize this invention.

Or I'm totally wrong. Same chance.