Hmm to summarise because I'm lazy. Good point about a gearbox being not worth 20-30-40k however I once blew a gearbox at just under 200km/h and I can tell you that I'm lucky to be here.
Had a gear come up through the floor pan, and miss me, but still. It sheared one of my exhaust pipes off causing the back section to drop straight into the ground lifting my back wheels into the air at about 180, splashed very hot gear oil on my leg and also on the exhaust causing the cabin to fill with acrid smoke so i could barely see where i could barely point the car anyway.
Luckily the driveshaft was held up by the handbrake cable and didn't drop down too. Instant chop job otherwise.
Apart from that freak occurance, I own a Skyline so I can drive hard and that's what I do. Witness the fact that I rarely get 300kms from a tank of fuel. I feel the car deserves to be looked after.
To be honest, it surprises me how many Skyline owners drive like grannies most of the time.