I was talking about the savings on milking your own cow instead of buying milk, not selling it. As I understand it, you don't pay taxes on the milk your cow produces if you don't sell it. Clearly, this would be a purchase for a household, not a full size dairy.
I know that. I was talking about the amount of money a person has to earn (before taxes) in order to buy $2.50 worth of milk with after tax dollars.