My sister used to adopt me a donkey from there!
I was talking to someone from Age Concern the other day about how children's charities/cancer charities receive a lot of donations etc, whereas organisations like Age Concern don't get as many because of the prominance of those issues in the news, and the fact that people seem to be more sensitive to issues surrounding children/animals than older people, for example.
In this case, I think one explanation might be just that people don't like to think of domestic violence happening, and if it doesn't directly concern you, a lot wouldn't think to go searching for such a charity to donate money to.