Some of both. Machine harvested grapes have a lot of field run, leaves and twigs, etc, and also the grapes are not as gently handled. So you at least have to keep the larger pieces of cruft out of the fermentation vats. But marketing image is also a big part of it, rightly or wrongly, which is all top-line dollars, less cost of harvesting crew, of course, but it pencils out. We are talking premium wines here, not two-buck-Chuck.
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