Where you get hosed is if you have a lot of options. I learned this the hard way with my CLA 45 AMG, which had over $15K in options. Many dealers assess the market value of the car based on year, make, model and mileage. They don’t really care about how many options it has. I had a dealer literally scroll through all of the 45 AMGs he had pulled up on his phone and he was just taking an average, despite many of them not having nearly as many options.
This was a big factor in my buying process with the 4BW. It had to have a manual and be the right price. The MSRP was $67K and with rebates and discounts $62K. Made the hit on the AMG more tolerable.