Especially for luxury vehicles. When you want to sell, you either have to be serious about selling or don't bother. The longer you hold, the more it'll depreciate. The few guys on here always post something like "If it sells, then it sells, not in a hurry". That's the kind of seller you never want to approach when buying. In the end, they hold longer and lose even more and now they REALLY have to keep it.
You can easily get a used AGT for 80 to 88k now with low mileage, while touring owners asking 88k. Accept the truth and sell seriously if you ever want to sell. Just my 2 cents from my observation.