> "But you see, my time is worth $xx, 24/7/365 - so 30 mins saved on task x is a net profit for me" (even though, in fact, they would not be working during thos

> "But you see, my time is worth $xx, 24/7/365 - so 30 mins saved on task x is a net profit for me" (even though, in fact, they would not be working during those 30 minutes) You're right. If their leisure time were merely worth as much as their regular wages then they ought to be working those 30 minutes instead. Since in fact they made the opposite choice, they clearly value their leisure time more than what they would have earned by spending that time working.