Flex, no is the short answer. I know a few people who only use an independent to service watches, which warrants a much lower cost but the same level of servicing (depending upon the watch maker). Rolex's should last 10 years without a major service (which is circa 450 from Rolex, and expect the watch to be gone for a couple of months). Breitling minor service is around 150, major being around 400, but again only if you go back to the manufacturer. I wouldn't get too hung up on servicing costs tbh.