Napa makes superior wines to the Central Valley, maybe not the volume. Not to say necessarily Clown Newsome's winery is any good.
Follow up. Newsome’s winery apparently is $hit per Yelp.
PlumpJack Winery
https://yelp.to/qTKq/eZUgQXCsQ7
“....maybe not the volume...”
In the US wines have become common and are purchased based upon price, style, and availability. When a region gets saturated with the amount of wineries like NAPA they lose their competitiveness and start to sell what they can...hence the largest selling wine in the US is white zinfandel which is one of the cheapest wines on the market. But it is marketed as a cross breed which can go with everything so the public thinks they are smart for buying it, not necessarily for quality as for campiness. Prior to the drugs that keep me from consuming alcohol now, I wouldn’t clean spark plugs with it.
So in the grape producing areas, volume is more profitable thus greater sales. Quality is secondary but not as profitable. After all, most of the people elected Obama twice. Same thing.
rwood