You are of course quite right, Howard. When has spent spent that much money on a car, it's important to do what one can to maintain its resale value, even if that might mean denying oneself the pleasure of using it as often as one might like.
But what I find faintly bizarre is the way that the market places such a high value on low mileage. Anyone who knows anything about cars all agree that it's failing to use cars enough that causes most of the problems - which kind of implies that 'the market' is primarily composed of people who don't understand much about cars and the way they work, maybe?
I would think that a couple of thousand miles a year is a good working minimum, and more than a year or two sat without any significant mileage is a bad sign, regardless of the make and model of the car.
In the days when my mates and I were buying stuff privately rather than through the trade, we always used to say "Don't look at the car, look at the guy's workshop" on the basis that you could tell much more about the seller's maintenance skills that way.
Still, good for people who know their stuff, if they can pick up nicely-used cars for a 20% discount, maybe?