One of the things I discussed with Norbert was the fact that as soon as a player stepped away from the machine, they could get distracted, beer, food, another player asking how they doing etc. And this could lead to a player forgetting to report a score back to Norbert. The idea was to make it the winners responsibility at the table, as the winner is more likely to want the score recorded correctly.
Also this method also allows Norbert (or whoever is in charge of the spread sheet), to step away and take a break, or watch the comp, fix machines etc.
Not saying this is the best way to run it, but it's just what came out of our discussion after the event.