You make it sound like a bad thing that dealers only use genuine parts. I wouldnt want to them using inferior knockoff parts if i took my car to a dealer for work. They also have to meet dealer standards, and guarantee the work.
Yes, the parts are likely more expensive than buying the same thing overseas or aftermarket, but its generally not because of "massive profit margins", it because we are a much smaller market and thus costs are high in the first place. Repco and the likes have HUGE margins on their parts (just get trade on a set of brake pads or something and see how much cheaper than retail it is), but you dont complain about that.
Yes the labor at a dealer will be higher, but as we see all the time, a dealer can usually get the same job as "averages joes mechanical services" done in less time because they have all the right tools and experience. We often do work to fix issues that other workshops have charged an arm and a leg for but couldnt fix, and we do it first time for less than they have paid the other workshop.
Anyway, thats just my rant. I get tired of people slagging off dealers, they arent out there to get you.