Okay, professor, that went over my head.
Blog post a comin' but the essence is that the brew house is a fixed cost (does not depend on the amount of beer produced - until you need more capacity). The implications of this I'll explain over at Beeronomics - will alert you to its presence soon.
As promised: economies of scale
NOTE: Blogspot has been eating some comments, and there doesn't seem to be anything I can do about it. IF your comment doesn't appear, it's not you, it's not me, it's the genuiuses at Google. Sorry--