Why shouldn’t those who travel without checked luggage should get some kind of discount? They don’t tie up the check-in line, requiring the presence of the age

Why shouldn’t those who travel without checked luggage should get some kind of discount? They don’t tie up the check-in line, requiring the presence of the agents and bag handlers, they do not require the labor of the baggage handler on the other end of the trip and anywhere in the interim. Fuel cost savings are likely minimal, but labor costs at the airports can add up fast.