I keep tripping over the word "donated," because I keep thinking, "Wait a minute ... this business model hinges on processing a raw material that the producers won't get paid for? Even wet nurses got some sort of compensation back in the day." But I don't know if milk bank donors are actually donors, or if it's possible to sell your breast milk. After all, you can already sell your blood and your sperm or ova. Why not your breast milk?