We are already paying a premium for subsidized food. From what I understand Big agri is very subsidized and smaller producers are not. That means a portion of the price premium (the spread) is not a real production cost, but just a lack of subsidies that competitors receive.
If BigAgriBusinesA receives more $ (on a per unit produced basis) than SmallAgriBusinessB , then there is a price spread that is not due to efficiency, but due to meddling by the gov't in the market.
Also, if premium food does in fact lead to premium health, then one might argue its cheaper to eat premium food than the total bill of cheaper food + additional health costs. This may not work for organic kale vs reg kale, but just might for potato chips vs reg kale.