Consider that everything which happens to get you airborne in an aircraft, happens because a person did work. While you are airborne, you can presume that the efforts of all those people are in some way devoted to you, and you should expect to be paying them fairly for that. Perhaps the cost of living differs in different locales, and thus the wages for the people who keep the planes flying are associated.
Every consumer is entitled, and indeed wise, to shop around. But when you make your selection, it's a little harsh to then suggest that the people doing the work to keep you airborne there should not be paid fairly for that work.
Do you tip a good server at a restaurant? Or ask them to justify the price of the meal?