If you are going to be in L.A., one of the recent editions of Brand X had an article about successful beer-only micro-pubs that somehow makes money. If you just stick with booze, you are going to be OK. A friend of mine used to be one of the owners of the Yardhouse.
The Yardhouse is certainly quite successful, on a much larger scale.
Looking for the Brand X article. Only found one about the BoHo pub so far.