Just a thought, but my family used to own dairy goats, and while we couldn't sell the milk, we made goatmilk soap to sell. Goatmilk is especially good for soap. It's very similar to human milk molecularly, and so it's is easily absorbed by human tissue, replenishing compounds that promote skin health. So I'd imagine that the human/minotaur milk could also make good soap that the farm could use as a source of revenue. Not as kinky as people drinking the milk, but cum can be swallowed or splattered on someone so it's kinda the same.