Why would AA even want to sell a $200 A->B->C ticket if someone is willing to pay $800 for the same A->B seat? On other forums, people mention the whole "price,

Why would AA even want to sell a $200 A->B->C ticket if someone is willing to pay $800 for the same A->B seat? On other forums, people mention the whole "price, not cost" thing, but I'm talking about price. I'm thinking that limitations in their pricing algo make the seats non-fungible. Maybe they just reserve some % of seats for connecting flights and calculate A->B pricing independently from A->C, figuring it's good enough as long as customers don't exploit it. And if the seats were fungible, the price fluctuations for A->C might be wacky, like staying at $800 until A->B is sold out.