^^
I think they all always put genuine stuff. Just my estimate, perhaps incorrect.
Yes they do charge a lot. Even minor body damages which normal denters will fix, dealers will almost always opt to replace the whole part, paint it and all, obviously costing hugely more than just a simple repair which was possible.
Anyways, all dealers worldover charge substantially more than ordinary mechanics and workers on the street, but if they screw anything up you can always give them an earful and MAKE them straighten it out. For street repairers, well, its not always posssible.