Let me first say each dealer is unique so don't start to stereotype please....
Of course driving a fancy car will get your VIP service. Is it proper? Probably not but it's human nature. A Bentley guy certainly pays for his Bentley service and the NSX does has the benefit of looking more $$$ even though it maybe half the price of a RL client.
The ONLY dealer I would mention here which 95% of the time guarantees good service no matter where you bought the car is Lexus. I've owned my share and they give you the best service BAR NONE IMO. Any other brand is hit/miss minus the exotics which may also suck! My friend's dad brought in his 300 mile Bentley with a dead battery on a tow, dealer charged $600 for the battery and no loaner!
Acura/Honda is just another brand to me, high end or not they offer decent service but their prices are never that great. If you want to save money but online or do it yourself. Dealers are out to make money so I don't really mind they want to charge high prices, I just don't go there. It's like going to a high end store like Tiffany's and complaining....their prices are known to be high and their quality is just average to me. But people still go there to buy and I have yet to see a guy complain to his wife it costs to much openly in public.
We all have different levels of perceived value so what is a good deal to one guy will seem ludicrous to another. Take the Mugen brand for example, I find it stupid to pay $6k for a set of rims but always a schmoe that swears it's the holy grail of parts
See my point?
I've had great service with BMW "usually" but I do agree they suck at giving out loaners. It's my choice to deal with it since I love the M-cars.
My point is don't buy a car because of the dealer or what you are entitled to in terms of treatment. Buy the car because you love the car, the rest really doesn't matter to me at the end of the day.