It's got nothing to do with that correlation. My point is that it closes off opportunities for smart-and-poor people. (Today's system also has drawbacks, but let's not forget that it does afford opportunities to people who wouldn't otherwise have them.)
Educational attainment for intellectual gratification is good.
Educational attainment for career and financial condition improvement is also, but independently, good.
It would suck to have a world where only the rich (or perhaps "only the rich plus people for whom their parents are willing to pledge a house they own") can afford to attend high-end colleges. That shuts out some intellectual development [and economic and social mobility], but I'm focused on the "hey, it's great that you're smart and did well in school, but because you're poor, here's a broom..."
Or is it just a scam on young people?
Last time I checked most lessons were freely available on internet, without paying $200000 gate keeping fee!