Yeah modern high end cars are more or less worthless after 10 years, they lose half of their value alone after the first 3-4.
OTOH because of great CPO warranty's and places like Carmax you can buy an S550 4 matic off lease for about 50% of MSRP.
The kicker is I just sold my 2005 Chevy for $5k and the original sticker was $19k.