Originally Posted by GlennR

That's because they don't last. After 2-3 years the first owner/ lessor sells the car. The next keeps it for a few years until things start to break. They are overly complicated and any little thing is a $1000 part. The 3rd owner thinks they can afford to maintain it but quickly learns it's a money pit. The 4th owner always wanted a Mercedes and also learns they're constantly putting money into it. The 5th owner buys it cheap, thinks they can fix it themselves but learns they can't and it sits in their driveway rotting away.

While most Japanese cars, such at Toyota, Honda, and Korean Kia do last for over 200,000 miles with only minor repairs.
When it comes to Mercedes, only the second owner gets value. They buy it after the major depreciation and sells it before things go south.