However, there are a lot of arguments. And there are many ways to perceive value. At the $30,000 to $50,000 price range, Pateks/Vacherons/APs/Breguets are not usually double assembled. Thus, outside of materials, design, the biggest variable here is man-hours or time it takes to make the watch. That and other technical flourishes that Lange brings to the table, would definitely suggest that Langes do require more man hours per watch. BUT! More time required doesn't always mean that it costs more to make...
I cannot forget to mention this... Watchmakers in Switzerland at the Patek/Vacheron/AP/Breguet level are more highly compensated than those in at Lange Dresden, Germany. Keep in mind, the Swiss Franc is very strong right now (really hurting exports for CHF), and the workers there are more highly compensated than those in East Germany. So, from a cost perspective, Lange timepieces should still be lower in overall costs than their Swiss equivalents simply because Lange does have significantly lower labor costs - and probably lower facilities costs. Tax and accounting laws in Switzerland also are different than in Germany which further complicates the whole matter. Keeping in mind, many of these Swiss brands are in Geneva which is one of the most expensive cities in the world to live in. And Dresden is a much less expensive city to live in.
But, from a watch enthusiasts' perspective. As you mentioned. I absolutely agree with you! But just to bring up a counterpoint, not everyone sees it the same way we do.