I had a friend during graduate school who would pay to have her laundry done by a service. She had two children, and was by no means wealthy. One day I asked her how she could even think of wasting money by having someone else do her laundry for her when she could just do it herself and save money. She looked at me with a pitying stare and said, “There are two things in life that you can spend: time, or money, and right now I’m shorter on time.”
The time commitments to her family and her school meant having to pay for things that I had the luxury of doing in my down time. Compared to her, I was time-rich. This meant that I always budgeted to optimize for saving what little money I had.