Northern Brewer was selling a product like this years ago, and I never understood it, for the reasons mentioned. Very costly, and I would never use a starter medium that has not been fully boiled. If you have to boil and cool the dilution water (no you can't trust bottled water, and you'll pour it over a non sterile bottle lip any way,) then open it up and pour in a can of concentrate (again over a non sterile lip,) well then you'd better boil the whole mess again and cool it.... Nope. DME, water, one drop of Fermcap, boil with a piece of foil covering the flask, and cool. Cheap, easy, quick and sterile.
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