Sounds like what I used to do in the UK many many years ago. I cultured a yeast from a bottle of Jennings ale from the Lake District (on the same principle as Aussie Coopers) and re-used that yeast for years. I often used it with the EDME lager kit - and used to call the beer "JEDME"
I'm going to do the same with my Morgans yeast from now on as I intend to use it for all other kits including Coopers, as I reported on another thread, and don't intend spending 2 dollars or whatever on endless packets of Morgans dried yeast.
