We can acid frost the outside of your bottle, provide ceramic color and gold decorations, or print your label right on the bottle to enhance the perceived value of your wine.
Wine companies must take market share from competitors in order to have any significant growth. Competition then becomes based on product differentiation: making your product seem better in some way versus your competitiors. One common method is by improving the visual impact of the package on the customer in the store (or ads, etc.), A.K.A. pop (point of purchase appeal).
The frosted bottle does just this: makes your wine bottle better, more elegant, important, and prestigious when compared to competitors who use a plain flint bottle.