Every Purchase Buys Something With Your Time
Money came from hours of your life first. Sometimes that makes a price easier to understand.
Money usually came from your time first. Turning a price into work hours can make a purchase easier to judge because the number stops being abstract.
That does not make every expensive thing bad. It makes the trade visible: this object costs three Tuesdays, or half a month of spare money. Clear trades are easier to choose on purpose.