You do make good points, but, eh, the car analogy isn't the best. It's probably not quite the same anymore, but vehicle commercials do seem to often depict rather aggressive driving.
And, in the old days, there was this:
This was more prevalent in the muscle-car era of yore, but does demonstrate the halo effect, I think.
Personally, I kind of assumed that the halo effect wouldn't have much of an effect with regard to the GPU market, but look how many times, just in these forums alone, we'll see people claim that AMD is a complete failure, simply because AMD couldn't match or beat Nvidia's top tier card?
It's absolutely insane, in my opinion, and some of it certainly is fanboyism, but it seems very real.