The same could be said about any variety of apple; they are cuttings grafted onto rootstock. The grafted sections were cut from a tree of that variety, which was grafted from another one of that sort, going back all the way to the original one of that variety that was discovered (most likely thanks to Johnny Appleseed). Apples are clones, just like bananas; sexual reproduction of apples creates in most cases, apples which aren't good for eating. I suppose with apples, one difference is that you can use different rootstocks for some diversity and resistance against soil-borne diseases.