I assume you mean *human* breastmilk, and the reason for its value is quite simple really: 1) it’s rare already. It’s pretty much only produced by lactating mothers and lactating mothers only (usually) do that while nursing and 2) it’s incredibly personalized – each baby, at any given suckling, has a direct and near immediate impact on the exact composition and formula (pun not intended, but it’s still nice it worked out that way) of the milk it is receiving. The composition changes in direct response to immediate need, such that a baby suckling and someone else suckling, less than 5 minutes apart would receive milk with a composition so different that it *might* even affect the taste.
TL;DR: Rarity and personalization.
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