I think maybe some people feel a bit funny about the idea of someone elses milk because for years now we've had the whole "sharing bodily fluids spreads HIV/AIDS and other diseases" rammed down our throats for years.
EVEN though there's a thorough screening process etc. I imagine it's hard for some people to get around the idea of feeding their baby something that has come from another human being. The whole "other species" debate probably doesn't worry people because a) we drink cow's milk anyway so it's seen as "normal" and b) formula comes in powder form and it's easy not to think about where it has come from.
I'm not arguing against BM banks at all... just trying to explain why people might have issues and feel "disgusted" by the idea. As it is, there are plenty of women who don't even give breastfeeding a go at all because they see the concept as being really "gross". It's all got to to with how our society has kind of turned really artificial. I don't think the women themselves can be blamed when we have the "artificial options" thrown in our face all the time!
Also, how many times have you seen/heard people baulk at the idea of someone breastfeeding past 12 months?? People just don't GET the benefits of breastmilk. They honestly believe that there's something wrong with women that want to BF until the baby decides to wean.
It may not be right, but it'll take a lot of time and education to change people's minds on the issue!
I voted "not sure" because I still feel a bit "ick" about the idea of taking milk donated by a stranger but I still think it would be a better idea than formula.