If you're rich, and have $40 (or $140k) and four years of your life to devote to it, then, by all means, go get a humanities degree.
I think that it's just as useful and enriching as spending $140k and four years learning to become an expert windsurfer, or skateboarder, or glass blower.
However, for anyone who doesn't consider $140k and 4 years "discretionary entertainment budget", then a humanities degree is a huge waste.
People justify humanities degrees as teaching you "how to think" or "how to write".
Hogwash.
Most engineers that I know think far, far, far better than most humanities majors. The humanities only rarely require critical thinking. Further, they don't even train you, in any real sense, how to reason by analogy or how to write well. At most, they filter the folks who already know how to do these things.
Having attended an Ivy League school and seen both types of education, I would not recommend the humanities to anyone other than idle children with trust funds.