But if they do the work for me, then my time is less valuable. If my time is less valuable, I won't pay more to save more of my time.
The time of a factory worker who runs machines producing 200000 widgets per hour is far more valuable than the time of a worker making 1 widget per hour by hand.
GDP per capita has a strong correlation with average wages. The more productive your economy, the more money the average person makes.