Right up until they day we are "wined"

Heh heh hehe
Milk and eggs are just another way of eating the parts of the animals we already eat. We don't eat koala bears or drink possum milk, or eat snake eggs. I mean, we could, I guess? But really, let's not kid ourselves into thinking it's absurd or strange in any way to eat the eggs of a chicken or drink the milk of goats or cows. It's been done since ancient times:
(And yes, I know that is a wolf)
I don't eat meat (chickens, cows, pigs) but I do eat fish and dairy. There is a word for this believe it or not, ovo lacto pescatrian. That is really just gobbledy-gook though...I'm just not a full blown vegetarian. Even though I don't like the practice of eating animals, I certainly don't think it's strange - it's really quite natural to hunt and fish. The way we eat animals today is just so far from the hunting and fishing model.
Likewise, dairy farming is not weird or strange, nor is it odd to eat "a chicken's period" aka an egg...I don't think milk has all the health benefits that the dairy industry would like us to believe (in fact milk by itself is fairly indigestible to a large part of our population) but it does have vitamins and minerals. Some of them such as Vitamin D are added after the pasteurization process.
If you're talking about the immune boosting benefits of breastmilk, I do not know for sure, but I would THINK those would be removed by pasteurization. Amino acids and enzymes just do not hold up to that process.
If music was meant to be played on MP3 players, wouldn't we have had them on the shelves before cassette tapes?
007, this is really not a fair analogy. There are countless incarnations of music and the technology associated with it, but the simple act of nourishing a baby with breastmilk has only one.
Infant formula is an alternative for mothers who cannot or do not wish to breastfeed, if there was breastmilk on the dairy shelves right next to goat milk (say) I am sure it would have been in popular use by now.
Incidentally, I would definitely be in support of a movement to try and come up with the logistics of how to market breastmilk in this fashion (in a way comparable to the way the FDA handles new supplements) but to make it an ingredient in ice cream so that well-to-do novelty seekers can get their kicks, at the expense of women in much different financial circumstances...just doesn't sit right with me.
I'm sure a few of these women sold their breastmilk for non-financial reasons, just like some people donate their plasma for other reasons besides money, but for the most part....I mean.