Big winner: event planner, event location, and PR publishing service.
Not so big winner: person who claims to be Satoshi as he gets for sure some cut and fame and journalist contact.
Big losers: everyone who paid.
Satoshi would never hold a press conference like this, even if this is beside the point, it can be the second point. First point is, Satoshi can prove himself in the same move to introduce himself.
Well, when you look at the amount of money CSW took from the people who he convinced that he was the real Satoshi then you can see why other people would want to give it a shot. You don't need a lot of people, just enough so you can make some money and then go on to your next scam.
-Dave