Isn't what we are really talking about here, the experience? It's no different than for amusement parks. There are many other amusement parks in the world other than Disney World, and many with some very fun rides. But there's that something Disney World has that makes it a little more special. Doesn't mean you can't have fun at any other park, but Disney has that something extra that makes you feel like you had a great vacation. Same thing with cruise ships. There are other cruise lines that you can go and have a great time on, no question. But there's that little something extra on
DCL ships the others don't have. Not to oversimplify, but that's really what it boils down to.