He's saying putting a price on it helps gauge market demand as expressed by willingness to pay, a signal that people find it valuable. What's so unreasonable about that?
He didn't say it is a way to find what's important, he said it is an important signal to find what people value enough to spend their money on.
He didn't say it is a way to find what's important, he said it is an important signal to find what people value enough to spend their money on.