The value of money changes depending on how much time was traded for it.

The same amount of money means different things depending on what it cost you. Money earned in hours you enjoyed, at work you would partly do anyway, is cheap. Money bought with years you cannot recover, health spent, or evenings your children remember your absence in, is expensive, and it should be spent with that in mind.

Before a purchase, convert it into your own hours. Not to induce guilt, only to make the trade visible so you can decide it rather than default it.