Yes, but the product probably costs 20% of what the craft product costs to make.
If we're just talking about ingredient costs, and about Budweiser versus, say, Ruination, sure. Budweiser versus Boston Lager, no way.
And ingredients are just a tiny fraction of what it costs to produce beer. Utilities, packaging, taxes, insurance, labor, transportation, marketing, R&D... Economies of scale can bring you small gains in some areas, but not a factor of five across the board.