Further extremes: I was asked one time why doctors get paid more than street sweepers. (This was noted in Cuba manual street sweepers with a broom get paid $30 a month because their job was outside and dirty. In Cuba doctors are paid $20 a month because it is indoors and clean.)
In that case I said it was more difficult to become a doctor, with lots of training and education. Few people could qualify. People’s lives are in the doctor’s hands. In contrast, just about anyone could push a broom, sweeping the streets. No real education or skill set. Many would qualify. Supply and demand are radically different. (Incidentally, lots of Cuban born doctors have fled to the US, they do not get paid enough in their home country.)
Please note, I am not comparing a pilot to a heart surgeon. Nor am I cheapening an aircraft mechanic to someone sweeping the streets with a broom. Aircraft mechanics are held in high regard by me. I appreciate their work.