It can be very useful to understand how much people do pay for things and why, if only to get a grasp on how totally context dependent pricing is and how irrational people are.
And you have to be very mindful of how you gather this information.
"How much would you pay for [x]?" is the ultimate question-you-can't-ask-directly.
Even "How much have you paid for [y] in the past?" can raise all sorts of defenses.
Individuals and businesses all have multiple different buckets with different rules. We all know this, but don't talk about it enough in product design.
It's kind of like JTBD, but that framing can lead you astray. Analogous thinking is powerful when you get it right, but it's tricky and disastrous if you get it wrong.
This is why it's important not to narrow the focus of your questions too quickly.
Asking direct, pointed questions often elicits a pack of lies.
Purchasers do not actually think of themselves as "hiring" milkshakes or other things to do jobs.
Hiring and firing are not part of the average person's conceptual model of life. So it's ridiculous to think that framing is customer-centered.
…if you are interested in learning things.
It's popular because capitalism demands waste.