I don't think there is really a person named Satoshi, but most likely is a real person hiding his/her real identity. He might be now rich because I am sure he is holding a lot of Bitcoin which I know is good for his/her lifetime. Showing the identity of the person will only put their lives endanger because people will start pursuing them.
Of course he did not use his real name, if you are trying to hide your identity thats rule number 1, but even if the is holding a big amount of bitcoin there does not seem to have an attempt to convert those to fiat or do something with them besides just being there laying dormant.