I went to a Braves game at Truist park last week and paid $17 for a small mediocre burger with no sides.
At Connections Eatery, a Mediterranean Burger sets you back $12
So no, given the circumstances, Disney's prices are generally quite fair for food. Theme Parks, especially WDW, are unique in their extreme isolation. To escape its monopolistic grasp requires embarkation on an extended trek.
The better question is whether Disney is taking full advantage of its situation. And the answer is no. They could charge substantially more for food.
No one likes spending money. No one likes spending $12 on a burger, but if we're really honest ourselves, Disney's food prices are reasonable.