I'd guess cost of labor is a major factor.
If you buy any California wine, for instance, it was picked by a migrant worker. Times haven't changed much since Grapes of Wrath, other than it's typically Latino workers rather than Dust Bowl refugees.
If you buy any California wine, for instance, it was picked by a migrant worker. Times haven't changed much since Grapes of Wrath, other than it's typically Latino workers rather than Dust Bowl refugees.
(I grow about a 1/2 acre of grapes here in Ontario)