Because it would be an 'open', the American guys would have the opportunity to compete as well. I like the idea of a blended competition...just as we see in track & field. Yes, the Olympics and World Championships give us the best-vs-best from countries around the world, but the regular Euro and American grand prix events allow the 2nd-tiered competitors a chance to face international competition.
It's probably too late to make it happen, but I sure wish Ben1 had given us a heads-up sooner that he might possibly cancel this event.