If you evaluate the best possible winning deal for a game, you can be pretty sure somewhere in the millions of hands played, someone is going to achieve that, or close to it. A dealt royal flush (there are always several of these in each contest) in triple play is worth 12,000 points in itself. The top scores almost always contain a very lucky winning deal worth thousands of points on its own, which is just the nature of the game.
Nobody plays 100 hands and wins them all. In this case, this is not an accurate way to look at a contest session. Some have wondered how a player can average hundreds of points per hand.
With thousands of players competing, it takes great luck to appear even in the top 100 scores. Keep in mind that in an entire contest, millions of hands can be played. These contests end up with very impressive scores at the top of the list.