I dont know if it's a generation thing or what, but when using fakebook I bet half the questions I get are "50% of asking price"
And that's how they start the conversation
Where I'm from, you don't start to haggle untill after you have seen the parts in person
I am on the seller and/or buyer end. Every state is different as to prices, supply of cars for sale, all variables. But people on FB Marketplace seem, in general, to be a group of their own. And it depends if the guy really wants to sell his classic. Screw selling parts on there.
My guess is here in Tx. probably 95% of all cars be they either projects, restored to some degree, and everything in between is priced 2 to 4 times market value. Too many overpaid NOT hungry sellers! Sure that is a seller" tactic and many times just uninformed sellers, or sellers that do not care if it sales or not.
An easy gauge as to market value is "save" a particular car listed for sale on Marketplace so you can go back in a few weeks, months, or a year and see IF it sold. That does not tell you the price of course. But if it did actually sell.
If I inquire about a car, and it is obviously overpriced, I try to ask in a nice way if negotiable. 95% if the time, the seller screams "Not dickering till you come look" and I reply man you are 4 hrs there and 4 hrs back. If it had NO issues, it is overpriced for me, maybe not someone else...maybe. Are you firm?
Sellers on MP hate to answer questions. If so, I walk.
If I have one advertised it is NOT far off fair market value, if any. Probably well below. So I just say, I honestly believe you will be well satisfied with my description /pics, please come look.
I have NO desire to try to sell parts out of my place. I had several good engine cores last year, priced below most any other advertised, and it took months to sell them.
The market on classic cars has been well depressed for several years. (Mecum means little.) Maybe different back in the N.E. I have sold some pretty nice "common cars' to guys 500-1000 miles away because they were priced well below anything they could find in their back yards. They drove after them or paid shipping.
High $ guys buy high end cars, and don't worry about a transport $. They don't buy cars off Marketplace.