> Wealthy people tend to receive a much more direct and immediate payoff for their time which is why they tend to be better about valuing it. This is why the first thing that most ultra-wealthy people I know do upon becoming ultra-wealthy is to hire a driver and start to fly private. For most normal people, the opportunity cost of their time is far more difficult to ascertain moment to moment.
Are you kidding? Poor people value their time, they just can't afford to use it more efficiently. I can't speak for Amazon shipping fees in particular, but if someone is eschewing a $5 delivery fee in favor of $3 of gas + 20 minutes of driving, it's because the marginal value of that $2 greater than the marginal value of that 20 minutes.