I think you are going to see year on year hikes in servicing costs............as the cost of a new Rolex keeps rising, it is fair to assume that the cost of a service in relative proprotionate to a new watch cost, allows service prices to rise. By way of example a £600 service on a £2k watch seems execessive but on a £6k watch seems reasonable.
So as the prices of new Rolex rise, I'm sure the service prices will follow it.
All the best
regards
John