I have a similar feeling about car dealerships as I have about casinos. They have grandiose buildings that look impressive but ultimately are paid for by customers.
Tesla have shown you can sell cars without dealerships.
I was recently quoted around 20000 baht at the dealership to fix the a/c on my Toyota for a new compressor and many other parts, not evaporator. Local mechanics diagnosed leak in evaporator behind dashboard, replaced same day 6000 baht.