The Subaru wheel studs are weak (compared to Nissan anyway), so they should be "greased". Not that ever do that. My old Nissans have no issues.
Took my BR to get the tyres replaced by Subaru workshop (bought tyres online, got it delivered there as they were closest), each wheel came back with a cross threaded stud. I had no issues removing and installing wheels, so the monkey in the workshop obviously stuffed up. They don't spin the wheel nut on properly and then ugga dugga the shit out of it.
But yeah, that price is absurd. Just throw in equivalent aftermarket studs in and away you go (if you can pull the brake rotors off, you can change the studs).
I'd also never take my car to a dealer unless I needed something scanned by their propriety scanning tool. Can't trust them to change an oil filter, or install a wheel properly.