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Well...

It is incredibly difficult to sustainably run a winery in California. The margins are often negative without operating at a large scale, which is part of why the industry has consolidated heavily over the past few decades.

Often times, wealthy people buy wineries as a hobby to dabble in, but end up selling and calling it a day before it drains their cash. If you want to buy wine for cheap that is made in California, buy mass-market wine.

Smaller brands are generally expensive because that price is necessary to sustain operations, but most of the time that fails, and the owners end up selling.

Little bit extreme