When you bring your watch in for a tune-up/overhaul they take apart the whole watch, replace any gears/parts that need to be serviced, lube it so everything runs smoothly inside, reseal it so it is watertight again and then clean it up hence the huge $$ involved. It is a time consuming process and is very labor intensive. The place I work at guarantees their work for a whole year.
When you take it to just any old repair place to put in a new battery your watch is no longer water-resistant (because they opened it up and never sealed it correctly or at all) and is more susceptible to water/moisture damage and THAT is a very costly repair. You could save money this way but I have seen OLD watches (owned by customer's grandparents, etc) that still look fabulous TODAY because it has been well cared for. Another plus for taking proper care of the watch, the value increases unlike cheaper watches on the market. Just a FYI
This is absolutely correct in the UK too,the watch gets a maintenance tune up,any moving parts etc changed so they don't become stretched and worn.Its a complete misconception that quartz watches have no moving parts,and if its explained to you by a trained SA it can save all the upset and heartbreak I'm reading on here.
Ok,I'll try and put it as easily and un-patronisingly as I can,if I fail feel please feel free to pull me up and I'll remember next time I'm relating info.x
Quartz and automatic watches both tell the time by moving hands around the dial, sometimes a date display( that is actually a disc with all the dates on round the edge that is joined to a gear that goes round 1 date place in every 24 hours) and very often a second hand too.
All the hands and forms of date display are governed by a set of cogs up or down geared depending how quickly or slowly they need to go for the job they have to do,seconds=very quickly,date=much more slowly.This is exactly the same for auto or quartz watches.So they both have a certain amount of moving parts to drive the hands.
The biggest difference between the two movements is the actual power source that moves the hands and other related parts. In an automatic,its power source is a mainspring,a very fine strip of temepered springy steel,if you see one in the flesh,it actually looks not much bigger than a wound up cat whisker! Its this spring unwinding and delivering power to the cogs who then adjust the speed and amount of power they need by up or down gearing to suit! The automatic part means it has a free spinning rotor weight inside it keeping it (the mainspring)wound so you don't have to do it every day if you wear it all the time.
In a quartz, the principles are almost the same as far as hands etc go,its just that the power source is a cell,or battery,but its not just this that makes it go there is a little peice of kit in there thats a bit like a transformer etc, not forgetting a quartz can have well over two hundred internal parts,some move,and some anchor the moving parts in place.
I hope this alleviates a bit of worry that some of you seem to be experiencing,as a general rule of thumb manufactures recommend that watches should be serviced every three to five years to maintain optimum running,rather like a car.If this was covered and servicing costs etc were related at point of sale it would be less of a nasty shock,and spoil the experience for you. The thing I mind most when my Rolex goes for a service is the length of time,not really the cost,but I know its been taken care of by the right technicians(who take three or more years to qualify) and I won't have to worry about my lovely timepeice again for 4 and a half to five years,not really that bad for a couple of hundred quid,or dollars to you ladies on the other side of the pond? I really hope this helps you.XXXXXXXXXXXXXXXXXXXXXX


PS I know this is long winded,and I hope you have managed to get this far,sorry!