This is Why We Don't Carry Sam Adams

http://www.washingtonpost.com/wp-dyn/content/article/2009/05/19/AR2009051900868.html

Koch's hospitality, however, won't prevent the inevitable. Perhaps as early as this year, and most likely by the end of the next, his fellow craft brewers no longer will regard him as one of their own. He'll be allowed to remain in the Brewers Association, the small-brewers' trade group, as an associate member, but his barrelage will be expunged from its statistics.

It's nothing personal.

The association defines a "craft brewery" as one that's small, independent and traditional, and "small" specifically means "annual production of beer less than 2 million barrels." Boston Beer shipped 1.992 million barrels last year.