It's very common in some parts of the world, this type of format. In others it is not as common as a round robin. But we made this move for a couple of reasons. First and foremost, to make sure that we settle the teams that would advance would be settled on the field, not by a tie breaker that was not only confusing to players and teams but confusing to those who organized the games. We wanted to settle it on the field.
The double elimination tournament allows us to do that and not have to rely on a tie breaker of runs scored or head to head competition.
Secondly, it provides us the excitement of knockout games, more compelling match ups when you get to the losers' bracket; that is, you are faced with a more win or go home scenario. We think it presents a much greater excitement for the fans in this type of environment, rather than pool play.