For those who think this person is being a good business person, think about it this way:
She has defective merchandize and is selling it off to an unsuspecting customer. THIS customer is going to be buying the dogs as pets (since they are not capable of breeding) and they are quite likely going to have a pet(s) with serious health concerns (if the dog has a uterine infection, this is going to just get worse with time left untreated).
From a BUSINESS standpoint, in their minds, it IS a logical decision. Nowhere did I infer it was ethical. I think we all get the fact they aren't good breeders. I'm just offering an explanation as to why someone would do that, not that I agree with it.