Hello
The valve adjustment is checked on a regular service. On a normal used car the valve play doesn´t change in high numbers while a hot session can move things and start a chain reaction. Valve play geting noiser is not risky just cost performance while to smal play will burn a valve off.
Now as a mechanic not "really" knowing how the owners use there cars you stay on the safe side.
But owners can do what they like and skip that part untill they fell uncomfortable or have a fatal error.
Now 570$ for the pure valve check seems a bit high ( but as far I know the swedish pricestructure still fair ) and i think it is a part from a regular service, but in fact on a 930 valve adjustment is a big part.
Servicing the turbos is a good finger exercise for the 964 and 993 engines ( Sorry forgot you don´t had the 993 RS and X versions )
Grüsse,
Roland
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