My questions and biggest concerns about colleges

First, I want to use this post to ask my questions and hopefully to get some answers that make sense.

Do colleges really need that much money to train a student or are they just too greedy?

I personally do not see why such amount of money has to be paid by every single student. Maybe the money goes into our text books and clothes, I don't know. I am aware that there is financial aid, but 25k, 30k or more dollars each year is still just plain ridiculous. I mean, what will the salary for each professor be in a college where students have to pay $30,000 each year? Where is the rest of the money going to? Some decorative head of an African rhino on the wall of the principal's house?

Why do we even need to pay for public colleges? Why can't it just be like pubic high schools?

We need good education to get a decent job and earn a lot of money. But at first we have to have tons of money beyond our imagination in order to get a good education. Seems ironic to me. Again, what I am wondering is NOT "why do I have to pay so much money", it is " why does such amount of money have to be paid". For the last time, "we have a good financial aid program" does not justify "we charge each student $40,000 a year".

Basically, all colleges are saying that they want no student to be left behind because of money, but the reality is that more and more students are being blocked out of college because of money each year, and I am most likely to be one of them. All of what I have mentioned previously can just be shortened into one sentence: Why the heck do colleges need so much money from each and every student?