One time I asked my liquor store guy why the hell the price of a 6 pack of my fav. ale was $7.50. He said, well believe it or not, its all based on how BUD prices their beer. BUD (aka the tide) goes up, then everyone plays catch-up.
I suspect that the premium on grass-fed beef will be "protected" and will rise as well.
EDIT: what he said.