i've only just gotten started with automatic watches - I have 3 and my wife has 2 - so I haven't had to have any of them serviced yet, but I can't imagine just throwing away any of the reps because they need service. The cheapest rep I have now my wife's FN Conquistador ladies and she wears that watch every day just about. She'd would not be too happy if it died and I told her to throw it away!
My LV Sub has an ETA2836 and I don't really know how much that movement costs but I do know that i love this watch and it is currently keeping to -1.5ish seconds a day. Maybe in 3 to 5 years when it needs servicing I'll think differently, but right now I plan on having it serviced and not throwing it away.
On a side note, my genuine Tag Heuer Targa Florio papers suggest servicing the watch every 2 years - what gives? Should I have it serviced at 2 years or wait until 5?