The reason why I say most people would not buy $90k Honda is not because the car would be bad under Honda name plate but rather the service. I'm not too sure about Acura dealer vs Honda dealer, but my experience w/ Infiniti dealer is 100X better than Nissan dealer. Infiniti sales tactic as well as many other luxury brand are alot more relax and give the buyer alot more respect. I feel alot more comfortable there and I'm not being haggle (sp?) for the sale. Also service is another story. Nissan as well as I assume Honda and Toyota would not just give you a loner car. While Acura, Inifiniti and many other luxury company would give you a loaner car when you bring your car in for a service. It's those little stuff that make a person willing to put down $90k for a car.
About the Supra, the ultimate goal is quite similar to the NSX. Have a really fast sport car. The execution is quite different though. In term of performance they're the same, but Toyota want a mass produced car that can make them profit as well as give them a performance image. While the NSX is hand built for quality. It also give Acura a performance image but it doesn't not bring in profit like the Supra did as well as not mass produced. Maybe that's one of the reason why NSX is still around while Supra isn't. Lets say you loose a few grand per car you sell, since the NSX only sell about 200 cars a year, Honda can handle those loses for the image. While mass produced cars like Supra, RX-7 and Z can't because with the same loses per car, it's too great of a lose total when they sell thousands of those cars.
My point about Skyline and Supra were that they are very fast sport car and they're in the same league performance wise to the NSX. The famous Skyline GT-R share its frame with the regular skyline which is what the G35 replaced. In Japan, the G35 is called the Skyline. However, the chasis is the only thing that's the same between the regular Skyline and the GT-R. From now on, the GT-R will have it's own name and it's no longer a Skyline GT-R, just GT-R.
I personally see the NSX, RX-7, Skyline, and Supra under the same group. I.E. top performance from the respective company.