Disclosure: I went to college 50 minutes away from where my parents lived and still lived on campus because I had to get out of living in the middle of nowhere and a 50 minute commute to class wasn't my thing.
Why do you think so many colleges have so much housing infrastructure?
Most people study grew up in places without any decent universities within commuting distance.
It's not just the elite universities that have housing infrastructure.
I remember that I was one of the few students in my year who grew up in the city in which my alma mater was based.
I couldn’t find stats, but my impressions is dorms are way more common in america.
Top university in my country, so not everyone could to begin with.
For the same reason each region - aside from those who had good schools themselves - was represented roughly proportionally to its population.
I don't imagine it's more than 20% and I expect it is substantially less. If so, what is the point of your objection?
The bast majority of people could do what OP did, but don't. That's interesting.