So It's really sad to think about the value of time or things? Don't you implicitly do that every time you chose an activity over another? When you chose a job over another? when you chose to spend your time with a friend or with your wife?
This kind of opportunity cost thinking can lead to things like overwork or ignoring your family. It makes sense up to a certain point but viewing your whole life through an overly simplistic heuristic can be a negative thing.
I literally use opportunity cost as a reason to spend MORE time with my family. It is not about money strictly speaking but it is about maximizing what matters to you.