I wouldn't say it's "incredibly good financial aid", especially in light of the nightmarishly high tuitions universities now charge and the fact that an inordinately high percentage of people have to take on nondischargeable debt. It's price discrimination. I'm not saying this is a bad thing; it's arguably for the better that colleges do this, because if they didn't, poor students would have no hope of attending, but price discrimination is still what's happening.
Also, only a token number of low-income students are admitted to the top schools, due to "extracurricular" admissions criteria that are socioeconomic by design. This is why these universities can fearlessly offer need-blind admissions; poor kids rarely pass the extracurricular hurdles.