Yes, THOSE are why it is expensive. The last time I put an Audi V6 back together was $8000 after one of the cam phasers got wrecked ($1200) when a cam pulley backed its bolts out (more $$$), with all the "while you're in theres" like the plastic air injection hoses that break if you cough with the hood up let alone actually TOUCH them, which go brittle when the diverter valves fail so you gotta replace those too, and things are cheaper now but back then exhaust valves were something like $70 a piece or something really really silly like that (6mm? hollow sodium-filled stems) and intakes weren't much better but at least there are 50% more of them to compensate...
But the labor isn't quite so bad.
Pete Remner
Cleveland, Ohio
1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.