That's easy. You are paying too much for watches. You would be surprised how inexpensive it is to make a watch.
If I can buy a single ETA 2824 from a retailer in Switzerland for $117 **shipped** on eBay .. how much do you think they are in bulk quantities, as a factory would purchase them? Less than half of that.
Can you see now where the $500 you spent on your Swiss ETA watch went? Right into a laughing man's pocket.
A decent quality Asia 21j powered replica can be had for $50 on the streets of South East Asia. That's with the factory's and the vendor's profits added in. Add in the price of a swiss ETA purchased in bulk, and you are crowning up over $120.
I'm not sure what your point is with this statement, actually .. the replica watch community has been around for years, and many of us here are qualified watch makers, watch repair people, etc ... how can you simply state that you "don't believe" it's possible to buy an ETA in a watch for less than $500 ?
I hope your stay here is a good one, and that you enjoy the pieces you purchase. There are hundred of photos here of genuine ETA watch movements in replicas bought by members. You can look at them if you like.
FYI the least expensive (but still good quality) replica I can think of is the NoobFactory Swiss ETA 2836 powered NoobMariner for $138