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Hey,
Having worked in the dealer auto parts industry, a long, long time ago, it is indeed in the middle. The average dealership mechanic worked on a flat rate schedule, there were waterpump guys, trans guys, brake guys, ect. They depended on volume to make the big bucks. When the 911 was newer off the assembly line they could knock out a valve adjust in 1/2 the book time,because they saw them every day. Fast forward 10 years, the 911 valve guy has transitioned to the new models and was busy replacing the IMS bearing or whatever is the new big MX concern and hasn't touched an aircooled 911 in 10 years, because the 2-5th owner has been going to an independent shop. The independent shop now realizes that they have a monopoly and priced accordingly. If one cannot work on their own car they will always be held hostage to the MX game.
OTH this is my 2nd 911, the first was crunched from the rear by an idiot, both were/are simple well engineered vehicles. When you look at the suspension components they almost look spindly and undersized. Porsche engineering embraces the concept that all systems are interconnected, and as a result the entire package is more efficient than other designs.