For a long time it was true that college was always worth the money.
Colleges were not places of opulence: they were spartan collections of smart hard-thinking people. If you were smart enough you could go there with them. You would pay a small amount of money, but everything was done very simply, so it was cheap.
Even for the people doing things like art history, it was still a good value, because there were so few people doing art history that many could find jobs doing that. And even if you couldn't get an art history job, hey, you still had a college degree: not many people had that, and you didn't get it to make money, you got it because you liked the pursuit of knowledge. That was a valuable signal.
As soon as people expected it to always be worth the money, that's when the seeds for disaster were sown. There was no reason for a college to not charge more and more and more, because the students kept on coming. They even saw a higher price tag as an indication of excellence.
Likewise, going to college is no longer an indication of a strong pursuit of knowledge, or even basic smarts.
It's a giant credential chase, and the people a credential chase hurts the most are the poor.