The gil price is likely imposed by the city-states to pull revenue from the use of their Aetheryte crystals. Now, one could rent a Chocobo or a Carriage or something, and that'd be cheap. Aetheryte travel is instantaneous, however, and costs a premium to use. After all, I'm certain the Aetherytes themselves need upkeeping as people continue to use it over and over again. They never explicitly say this as far as I know, but I believe it's something we can just infer. In 1.0, we had anima, which was a sort of "energy" as it were. Teleporting too much, too often would make you sick and weak. Hence when you ran out of anima, you ran out of your mental fortitude to teleport. That was canon. I don't know if they've completely nipped that concept, or if perhaps aether-based travel is easier now due to the calamity.
That being said, beastmen actually don't carry gil. They each have their own currency which is a part of their drop tables. The only beastmen that might drop gil would be the Qiqirin, the Goblins, and the Mamool Ja, since all three have been seen to have interactions with the five races and city-states.
That being said, beastmen actually don't carry gil. They each have their own currency which is a part of their drop tables. The only beastmen that might drop gil would be the Qiqirin, the Goblins, and the Mamool Ja, since all three have been seen to have interactions with the five races and city-states.