My personal feeling is the 5% is to high for luxury or expensive cars. I have one right now that I will be selling (2012 Porsche) and my immediate reaction was

My personal feeling is the 5% is to high for luxury or expensive cars. I have one right now that I will be selling (2012 Porsche) and my immediate reaction was a) I still have to prep and detail my car - I don't have to do that if I trade it in and b) 5% is to much. c) I don't want strangers driving my car. d) I don't want to be hassled with selling my car which is why I take the hit at the dealer. If you want to call it that. Remember also that trade in deals are actually negotiable. Like anything else. Also dealers actually typically try to slant a trade in toward giving you more money (so it gives you an incentive to buy thinking you are selling something valuable). You might want to alter your % based on price. And also create a way of separating sellers of higher priced cars from more commodity vehicles.