Interesting article in The Anchorage Press here about homebrewers having their recipes brewed by microbreweries.
Converting a homebrew recipe to a beer for commercial production is not a matter of simply changing the proportions of ingredients. Certain things are gained and lost in the translation, and because yeast is perhaps the most important ingredient, it has to be just right.
This article is about competitions in Alaska, but I’m sure there are others around the country. I’ll have to check around.