Earlier quoted context omitted.
Ok, how about a straight undergrad budget at a public university. https://www.admission.ucla.edu/prospect/budget.htm Depending on circumstances $25k to $52k for next year with a 10% increase over the next three to four years... http://trends.collegeboard.org/college-pricing/figures-table...
The UC is the top tier of a multi-tiered public higher education system. A CA resident, even one set on a UC undergrad degree isn't going to end up $200k in debt or at minimum, can easily avoid it.
Do we want to filter who goes to a top-tier university by those who are able to spend money there or by how well they perform? Doesn't society benefit the most if we are able to send the highest performers to the best universities without unrelated financial criteria knocking them out? And before someone points out financial aid - many potential people may self-disqualify before even getting to the point of applying.
Even if people can afford it, charging that $100k takes away capital that a bright recent graduate might have been able acces to bootstrap a startup. I think across multiple facets, there are a large economic costs we pay by charging high tuitions to students.