I helped change the spark plugs on a late 60s big block Corvette and it took hours. 1. Remove hood. 2. Disconnect and drain radiator. 3. Remove radiator. 4. Loosen motor and transmission mount bolts. 5. Jack up motor an inch to give wrench access. 6. Remove and replace spark plugs. Reverse 1-5 and hope you didn't goof anything.
That Corvette's era of sport car was very simple compared to any supercar. Lots of raw power but simple. BTW, the Corvette was quite a beast. Engine was rebuilt with Offenhauser parts. Big zoom.
Lots of things join their forces to suck $$$ from the owner. Expensive parts, expensive labor and complex machines.
—” ya gotta have big bucks to keep this class of car rolling.”
A friend’s friend was a Ferrari mechanic.
He claimed that on the older cars many of the parts are made to order, you are paying a factory machinist to make the part to specs. And it takes forever.