Yes from a collecting standpoint one of each set is perfect. But for more creative pursuits, you must have multiples of some items. I mean, really what would be the point of one pyramid? You must have three to do a decent dio! (I only have one, but would have three if Egyptians were a priority.) I know the pyramid was just an example, but the same can be said for armies of knights, medeival houses, ships, police cars, indian teepees, there are a lot of reasons to have multiples of items!