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So what if Prolacta is making a profit here? Babies in Africa who need breastmilk are getting breastmilk. Moms in the US who want to donate their breastmilk to Africa are able to donate it to Africa. If Prolacta wasn't involved, it's possible that neither of those things would be happening.
There are many, many people make money from charity (as charity is essentially an industry in its own right) - from the individual people who work for charitable organizations to the landlords who rent them space to the companies that sell them the goods that enable them to do their work... Prolacta provides a unique and difficult service, and thus the "price" of their help is high - which seems fair.
If a mother refuses to donate at all because she thinks Prolacta is taking too big of a cut, that's fine, but I'd hate it if anyone were arguing that the whole thing should be shut down for that reason.