"Worth" is such an arbitrary value.
I have been driving older F-series trucks since 1995....This does not make me special, it is just what I seem to gravitate towards.
I have specifically sought nice, but not perfect, used versions that fit my needs, and often they are a bit of a red headed stepchild because they do not carry the recent popular trend in options.
For instance, my daily driver for the past 7 years has been a 1990 F250, XLT, Lariat, standard cab, 8 foot box, 2wd, 7.3L IDI diesel, E4OD automatic.
I purchased this truck from OR, and had it shipped to my house for less that $8,000 total.
The truck has 62,000 miles and was still wearing the factory stickers on the rust free chassis.
MN winter has ruined all of that but this truck was an unloved, lesser truck.
After all these years of owning and maintaining I still don't have $11,000 invested in the truck.
Because it is rusting I have been searching for the last two years and have come to realize that older 1975-1996 F250's are no longer cheap to buy.
I used to get a very nice older truck between $6,000 - $10,000 (usually shipped to my house from out of state as part of that price)...with $10,000 being VERY nice...almost perfect.
Just last week I was searching for a replacement car for my wife, and while looking at a local Ford dealer, I took a gander at the trucks in stock.
They had a 2003 F250, with 218,xxx miles...yes that is right, 218,xxx miles, and the asking price is $13,000.
Go to Bring a Trailer and look at the huge number of 70's, 80's, and early 90's truck being sold for high prices.
It would seem todays' bargin truck price is in the $10,000 to $15,000 range.
A running and driving truck, in terrible condition, will fetch between $2,000 - $4,000 depending on desirability and options.
Lots of nice trucks are selling in the $18,000 - $25,000 range.
The days of me finding my next, cheap, useful old truck are gone it would seem...and I don't like it.
As far as "worth"?
No Alan, I do not think the older trucks are worth this kind of money....but there are enough buyers at these prices that the "value" is up there making them "worth" that much to enough people to change the prices....Dammit!