This issue exists everywhere in the USA. Go check the price for a movie ticket. At the end they slap on an additional fee. Why can't they show the fee included

This issue exists everywhere in the USA. Go check the price for a movie ticket. At the end they slap on an additional fee. Why can't they show the fee included in the main price? I went to the Verde Canyon Railroad, when gas prices were really low. Still a fee for higher gas prices on the receipt...