I noticed that in U.S. airports, there is a charge of around $5 to use the luggage carts.
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The trolley charge was introduced in 2009 following research undertaken by the Airport that indicated fewer than 5% of passengers now use trolleys. This is due to the popularity of wheeled luggage, the increase in passengers taking hand luggage only and the proximity of the terminal buildings to the car parks.
It's nearly always cheaper to book extra hold luggage in advance rather than paying excess baggage fees at the airport. Airlines know that keeping within weight/size limits is not always possible, so they encourage you to plan ahead by selling extra weight online.
The retailers have to pay a premium price for the small space they own at the airport. The fee they pay to the airport authorities is not set. To point out, airports charge a portion of total sales, so the more money the retailer earns, the more he has to pay to the authorities.
Airport transportation is expensive because it can be. The price isn't included in the facility charges because public transport facilities are rarely under the same management as the airport terminals are, and their interests are not necessarily in sync with each other or with passengers. Travelers are captive.