It's interesting that with a car, if you don't follow the service intervals they will void your warranty when it becomes damaged. But with a watch manufacturer they often charge a higher flat rate (1.5-2x that of some independents) to cover everything, while a large number of services don't require more than replacing crowns and seals - and they make bank on those.
But that acts as a subsidy to those few with a lot of worn parts who would not be willing to pay over $1000 for the extra parts instead of the $550 flat rate. The many more people who would grudgingly pay $550 instead of $300-450 just to get it done at the manufacture help to pay the higher costs of those who need more parts.
In my case, I pay my watchmaker a fraction of the cost vs Omega to clean, oil, and adjust a Moonwatch or 5-digit Rolex, which wont need parts every time; but when he sees that it needs parts under the microscope, then he's willing to put it back together and send it to the manufacturer and only charge their fee without any additional up-charge.
I've had him do one Planet Ocean with a 2500C, but otherwise he wont do a co-axial movement. Omega knew what they were doing when they put out movements that many independent watchmakers wont touch (Archer not included, as well as other certified Omega service centers that charge full price).