This is an interesting picture...
If I add up just the parts I can easily identify, at retail costs they total over $1300.
I'm sure the internal cost of parts is much less, but considering there's labour to be accounted for here, I'm going to say there's a good chance they did this service at a loss. But for them this is not a big problem, because they will do many other services that more than make up for watches like this.
So much waste in a factory service...seeing this drives me crazy.
Probably nothing wrong with the barrel - they just replace the whole thing instead of opening it and replacing the mainspring to make the job go faster, and waste perfectly good parts as a result. The barrel and wheel train bridge likely has a worn hole where the barrel arbor goes into it (common) and I repair these with a bushing all the time...that's $400 of the parts right there that could easily be repaired.
Parts replacers rather than watchmakers...
Cheers, Al