You do make a good point. At 1800 dollars it sounds like all 4 calipers. What are the chances of all 4 calipers failing after rolling off the lot?Your calipers could still be bad and resurfacing the rotors could be a "band aid" approach. Did you see the brake pads? Was the wear uneven?
Until then-we have another thread of guesses and not knowing the facts and/or yet another dealer bash thread.