The "real" value of a vehicle, is simple.
It's whatever price it sells for.
You can look at KBB, Nada, Edmunds, all the rest of the "guides" you want, but the bottomline is very simple.
If you find a car/truck you want, and you settle on a price, that price is the value.
It sounds almost too stupid to be that easy, but think about it. Is a 1971 'Cuda worth $1 million dollars? According to me, and book values, no. But that's what it sold for at Barrett-Jackson. According to book value, someone overpaid by around 900,000$.
There are also plenty of cars in Nada, like Buick LeSabres, that are "valued" at $4,000-5,000.
But you can buy them for under $1000 all day long.
When I sell cars, my price tag, is just that, a price tag. If you try to haggle with me, I tell you to leave my property. I don't care what book you want to quote.
Not a single person from any of those guides has ever come to appraise my cars, so why would I be interested in what their book says?
As far as my profit margin, I have bought cars for $500, and sold them for $3000. I've even gotten parts for free, and sold them for thousands of dollars.
My profit margin is no business of yours (not you specifically, of course). I'm trying to make money. Aren't we all? If you don't like my price, I'll find someone who does :)
A decade's worth of buying and selling vehicles.