there are more expensive places in BA.
and much much more expensive places in most other countries.
rich people dont consider expensive to be "unethical".
they consider them to be status.
I went to the Mallman restaurant Garzon, in Urugay, years ago, it was more expensive than Don Julio, although we ordered ala carte and split things. There was a Maserati SUV parked outside, the owner was dining inside. These days its over $200 a person if you have a glass of wine with your meal.
The current groovy sushi place in Los Angeles, by far not the most expensive, is a place on Sawtelle thats $250 usd per person, not including drinks.
Everything, everywhere, is more expensive than it used to be, but I think that Argentina is still a lot cheaper than the USA, apples to apples.
a hundred bucks a person, in Seattle, or SF, or LA, is not even unusual these days, and certainly not the "expensive" places, by far.