Well said but the trade are obsessed with mileage.
My cars are always pristine but also have higher than average mileage and the dealers always use that as an excuse to batter you on price at part ex time.
It's not an excuse so much if you go independent, go to the "Main Agent" and you will get a man in a suit quoting from "The Bible" who will always go for the lowest book price with mileage adjusted figures, if however you choose an independent dealer it is "their money" on the line so they can usually be a bit more flexible, trouble is, as an independent myself and someone who truly know's what high mileage cars are worth, the buying public always get a shock when you quote for high mileage cars as we in the trade are being offered them all day every day from company's, finance houses, other dealers and the like.
There are golden rules to taking in a part ex with high mileage and i will give you a true scenario: If a customer came in to me with say a 2006 159 JTD Turismo saloon in Alfa Red with 50,000 miles and black cloth trim ( as tends to be the norm with turismo spec) and another came in with the same car, but with cream leather, Ti Alloy wheels, but 90,000 miles, I for one will take the 90,000 mile car any day over the lower spec and lower mileage car, Why? experience of nearly 30 years has proven that nowadays more than anything, Spec nearly always outweighs mileage, more so on premium products, which is why a fully spec'ed BMW, Mercedes, Jaguar, Alfa etc with high mileage but in the best colour and looking stunning will always outsell a low mileage "plain jane" car, less so on say a Vauxhall Corsa, Nissan Micra etc: and of course the price is an important factor as well.
This from an "Independent garage perspective" a Main Agent would no doubt not agree with me as they sell on age (usually less than three years 30,000 miles) but you wont find a five year old "Top Spec" high mileage car marked up on their forecourt cheaply, they are just not interested and understandably.
At the end of the day it comes down to what you are prepared to take for your trade in, for some the dealer is the easiest if not the most cost effective route, for others they will persevere with the internet or magazine advertising either until they get their price or reality dawns! but remember, when you part ex you are "Trading in" note the word "trade" dont expect retail money and you wont be too dissapointed, and anyway, you can always walk away.........................