The parents are betting a ton of dough on her success. But what is "success"? What if she wants to be a stay at home mom at the end of this "process" (not that there's anything wrong with that)?
And where is the "balance" in spending 300k on one and squat-zippo on the other(s)?
Well, I have three thoughts on this. First, I think it places a huge burden on a child - even one who is extremely gifted - to be expected to be a huge success and to feel like he or she must do great things. It bothers my son will people say those sorts of things to him. He wants to have a nice life and have some success but doesn't feel that he has an obligation to do great things.
Second, some kids are just more academically inclined than others. I've known some moderately gifted kids who were very well rounded, enjoyed school, engaged in many school related competitions, enjoyed the competitive atmosphere in attaining admission to highly competitive schools. These kids can be extremely successful.
I did not have one of these kids. My son is extremely gifted in some areas, is not particularly well rounded, and has little to no interest in grades. He does think he needs to get an education so he can earn a reasonable living, he is curious about a lot of things, he does learn extremely quickly. But...he has zero interest in doing the things to go to a competitive university. He just doesn't want to do them. He wants to learn what he wants to learn but doesn't care if it earns him an A or B. So spending money to try to send him to a highly competitive university is a waste of time. It isn't what he wants to do.
Third, I have spent more for school on one child than others because he has had needs that require it. My other children receive a good education that is right for them but comes at a lower cost. OTOH, there are some areas where I've spent more on the other children for their needs.