You could make a similar comparison to mainland US cities Cincinnati and Dayton, Ohio. Delta has a nub @CVG and prices to/from there are steep while fares at nearby DAY are much lower.
The reason they charge infants is that on international flights all passengers, including infants, must have a ticket. They usually charge 10% of the adult fare plus taxes and fees. Since those taxes and fees aren't based on the ticket price they are the same for an infant. For example if the adult fare is $500 USD plus $75 in taxes the infant fare would be $50 USD plus the same $75 in taxes.
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