[JansjoFromIkea]

Don't know how school funding operates in the US so this is a guess:

Parents cover the fees and give the kids an allowance for the rest; either the kids budget poorly or the allowance fails to really account for just how expensive the first few weeks are with all the books you're expected to buy?

[SauciestGNU]

The average parent in the US can't afford an extra $12000 per year in expenses. College students take out loans to pay for their education. I'm not sure what the average debt load is currently, but people I personally know who got away with a "small" student loan debt owed around $30000, and I've known people with >$100k student loan debt just from an undergraduate education.

[cykros]

Parents covering school mostly went away in the 90's outside of the particularly wealthy segments of society. Mostly student loans since then, which people hope to have paid off by the time they retire to avoid having their social security payments garnished. Joking of course; nobody assumes social security will still be there.