They're correct. You should spend the same amount of time to save a dollar on A as you do to save a dollar on B. And you should spend 100x as much time to save $100.
If you're willing to spend 10 minutes to save $100, then you are only willing to spend 6 seconds to save $1. If you can't immediately identify a way to save $1 that would take less than 6 seconds, then don't try to save $1. Each person has a different time/dollar ratio. Some people might be willing to spend 2 minute to save $1, and thus willing to spend 1 hour to save $30.
They're correct. You should spend the same amount of time to save a dollar on A as you do to save a dollar on B. And you should spend 100x as much time to save $100.
If you're willing to spend 10 minutes to save $100, then you are only willing to spend 6 seconds to save $1. If you can't immediately identify a way to save $1 that would take less than 6 seconds, then don't try to save $1. Each person has a different time/dollar ratio. Some people might be willing to spend 2 minute to save $1, and thus willing to spend 1 hour to save $30.