I worked at a now-defunct micro in Colorado, years ago, that did this very thing. We brewed "Brewmaster's Line" beers; big beers, and sold them only in single-bottle 12oz'ers. If I remember right, I think they were going for around $2.50 each! Great beers though; doppelbocks, maibocks, rauchbeirs. Sold everyone we bottled! The key, I think, was that these were really remarkable beers and they were marketed as gourmet-niche beers! Went on to win a gold at the GABF with one!