It's not just knowing who he is -- if he's identified he might decide to move those coins. If he did that, it could affect the price. I'm not sure anyone knows what the exact impact of that would be.

I don't personally believe Satoshi was an actual person, and don't believe he'll ever be identified. Most likely the keys to those early blocks have been destroyed, and most people wouldn't do that unless there was an institutional reason for it.