Which is still about twice of what I paid for my entire bachelors and masters education in germany and it included a ticket for the entire public transport system in my city for the entire 5 years and full access to _very_ comprehensive library (of both physical books and e-books so there was no need to buy even a single book during my studies).

I may speak from a perspective of ignorance here but I believe 6000$ a year is still prohibitively expensive for a lot of people, especially if they don't want to accrue debt.