I have seen a lot of videos and instruction blurbs about how to harvest used yeast and store for future use in another beer. Is there a reason one can't buy a packet of yeast, pitch it into a starter set up to allow the yeast to multiply, then store again in smaller portions each ready to pitch into a 5 gallon batch, or to make a starter? I haven't seen anyone describe how they are growing with new yeast before pitching once. Would this yield a better yeast than using a yeast that has already lived through a cycle, since many say to pitch the re-harvested yeast in a lower gravity beer than the first? If you know of a site describing the process, please post!