@Jackster
People seem to forget service cost. Servicing a replica Rolex movement is not cheaper than servicing a GEN.
Technically, from a work put in point of view you'd think that's true, but I believe you'll find
@Natas78 has a slightly lower hourly rate than a Rolex service centre.
Or (god forbid) someone like Patek who want £110 to change the battery in a quartz match, and £1k-2k to service something with a few complications.
Yes, Rolex might keep your watch for 2 months but when your bill is "only" £800 how much time do you really think was spent on it, it's not even 10 hours is it? If they'd cracked on a bit you could have had it back 2 days later.
I took my VW T4 in for a gearbox rebuild and a longer 5th gear (that involved trailering it 80 miles and it was a rebuild, not an exchange), and said you may as well service it while it's there. That's probably more actual work than a watch service, and it was done in 3 days.