It's called price gouging. I was charged $4500 to have a door replaced. No metal work was done, just paint and hardware swap. My quote from a non-certified shop was $2,000. I know Tesla is working on this problem, but I think they kind of created the problem with their certification program. Growing pains.
This is the correct price for a door. I had two replaced as well at that price, along with a quarter panel. Was the non certified shop going to repair the damage? They couldn't have ordered a new door... if they said they could they'd be lying, Tesla wouldn't ship them one. Thus they'd be trying to uncrinkle a crushed coke can
I used to work in the collision estimation space, Tesla chose our platform for exclusivity on damage estimation. The costs are high because of two things:
1.) Tesla makes the parts
2.) It's aluminum, try to un-crush a can and "hammer it out" so it looks like new...
For reference, look at 2015+ ford f150 repair costs. those trucks are totaled like no-ones business because of the all aluminum body and the lower-than-tesla MSRP/residual value.