A lot. I've read of quite a number of people who ultimately bout a 2016/2017 STI, Golf R, or Camaro/Mustang instead. The Ford dealer network going after ADM coast to coast tainted the car, and definitely tainted our resale value. You want steady consistent pricing not high ADM then thousands off MSRP. That kind of pendulum or swing is no good for the owners, the dealers, nor Ford.
Ford's dealer network f'd everyone in their arse. What's funny and factual, is the Golf R. VW has consistently sold the vehicle at sticker and continues to do so. It's why that vehicle has been stable.
If looking for a RS today, 3k off sticker is where I'd start. Highly optioned RS's, I'd be pushing for $4000-4500 off. These Ford dealers wanna play games, f em, play right back. I bet we see $5-6k off sticker to move them, which hurts resale value significantly. The Ford dealers end up f'ing everybody. They are hazardous to even themselves, the idiots.