49 years working with Diesel engines. Parts prices and parts availability have nothing to do with their relative cost. Availability is the product of an algorithm of worldwide consumption, as well as the parts price. Parts availability is a function of inventory management. Also the scarcer the part the more the markup relative to carrying cost, I.e. time on the shelf. IMO that Volvo Parts seem hard to get and pricey is an indicator that they are not in demand and thus the engines themselves are highly reliable.
I agree, very reliable engines on two boats we owned over a 31 years of operation. Routine maintenance, filters from Napa, impellers, etc on line. As with anything mechanical maintenance and prudent operation makes a difference.
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