I must say that I agree with Caitlin Moran in the Times, I am always quite happy if a child can't make it to one of my children's parties. Brings the volume level down and less mess to clear up! More hula hoops for me
But then I've never paid "per unit" and just paid an entertainer or hired a venue which was the same price for whatever number of kids.....probably a better option for those who get stressed about no-shows.