I don't subscribe to this 'ETA is better than Asian' thing. It is far too much of a generalisation, and how many people in here can honestly say that they have kept an 'ETA rep' long enough to categorically say that it will outlast a non-ETA?
I've heard of 'genuine' ETA movement reps being DOA. I've seen pictures of 'ETA' movement that have had assembly problems. Likewise I have heard of Asia movement reps running +/- 5 seconds accurate per day.
It comes down to dealer confidence and quality control. I even saw one dealer (no names, no drill) casually failing to mention his 'Unitas' movements were the Chinese replicas, until another dealer let the cat out the bag.
Also, for how long were we all convinced the 'Lemania' hand wind chrono movements in the reps were the real Swiss deal until it came out that they were cheap but good Venus copies?!
The Zigmeister once said over on the old RWG that certain Miyota movements are every bit as solid as their ETA counterparts, but just like you will never convince some people that Rolex aren't the last word in quality watches, so will you struggle to convince people that a watch signed as 'ETA' isn't a guarenteed sign of quality.