Yeah and we've certainly made other choices that have an impact too, not the least of which is sending two of our three kids to private school. I'm not complaining. But being forewarned we know to tread carefully in our career choices as we get to the college years. It is something I didn't really think of before going back to school but I'm glad I'm aware of now, because my eventual income could mean the difference between generous need-based aid and next to nothing, even though the colleges DD is looking at cost considerably more per year than I expect to make.
As far as not admitting students that can't afford to go there, I'm not sure that's true. I was admitted to colleges I'd have needed to borrow far more than established loan limits to attend, even years ago when college was relatively more affordable. There's an assumption that students bound for college have a credit-worthy parent available and willing to extend their ability to borrow via PLUS or private loans, and in situations where that is not the case students can and do run out of money to borrow before graduation. Maybe not in California - I am rather jealous of the cheap tuition even though I don't envy you the overall cost of living - but in states like mine where even lower-level public universities have surpassed $20K/year, the current $31K limit on undergrad borrowing doesn't go very far.