All that is true but I think the OP's point was that it is easy to make yoghurt, not that it is easy to make some specific type. And it is easy if you can get hold of a pot of live yoghurt, then all you need to add is warm milk and patience and you will have something just as good as a lot of the ordinary supermarket stuff. Of course, yes, it is a bit of a novelty because it isn't cheaper by a wide enough margin to make the effort worthwhile.