I tasted my wife's breast milk a few times while my daughter was breast feeding. I suppose it is warm, but I hope you're not under the impression that cow's milk comes out if the teet refrigerated, LOL.
Anyway, the Ben and Jerry's thing wouldn't work. It's illegal to sell your breast milk in the U.S. It can be donated to milk banks, though somehow I doubt Ben and Jerry's will have much luck procuring millions of gallons of donated (or even purchased, for that matter) breast milk.