Also, I checked out onlythebreast.com and I have to say, some of those women are much better at marketing this stuff than me. If I had titled the post "I want to share my wife's rich, creamy breast milk with you", I wonder if I would have gotten more offers?
You could also process it yourself. Make and market the cheese yourself, so the weirdos can spend more time being weird, and less time learning how to make cheese. Not only can you charge an extra markup for added time and labor, but you also appeal to another niche market. With the addition here is your target audience.
1. Babies
2. Creepy people that want breast milk
3. More creepy people that want breast milk cheese