I actually doubt that Ferrari would fix a transmission if you broke it drag racing, even informally. But I think there are two distinctions:
(1) People who buy $250,000+ cars can probably afford a new $20,000 transaxle in the first year. People who buy $70,000 cars probably can't. The GT-R is a $70,000 car with the maintenance costs of a $250,000+ car. That'll catch buyers by surprise.
(2) The way in which Nissan denied warranty claims was offensive. They didn't look at it on a case-by-case basis and say "no, it looks like this car was really abused and this resulted from that abuse, so we're not going to replace this." They had a magic button, and you couldn't meet the widely-advertised performance numbers without pushing that button. But, when you pushed that button, even once, the car recorded it, and anything that happened after that point in time wasn't covered by the warranty. I mean, having a button that you need to push to reach advertised performance numbers, but that pushing even once voids the warranty, feels like some sort of violation of the principles of truth in advertising. It's really underhanded.