I'm surprised you re-posted the same failed argument you used before. A few years ago, a gentlemen discovered a long lost 1930's Mercedes-Benz 540K barn find. It was purchased for hundreds of thousands and needed many hand fabricated parts to restore at hundreds of thousands more. The value? $1.5 MILLON to $2.5 MILLION dollars!!! I personally know of Packards, Cadilllacs & even Mercs that have been restored in such a way. So your argument falls flat on its face.
Anyway, no one here started talking about "worth" & "cost" until you did. As with most of the population, you're only seeing the subject from your tiny, myopic point of view. As a collector of 7 vintage vehicles, I can tell you that just as many, if not more of us, restore based upon emotion, desire, & pleasure then with the concern of cost effeciency that seems to drive everything that you do.
Actually people with your penny-pinching view are why dumpy street rods exist at all. Back in the 40's and 50's people would buy junkers and street rod them because they didn't have the money &/or the talent to restore vehicles properly. Unfortunately they persuaded a percentage of the population along the way that these eyesores were "cool". These are the major reason that many cars are still "customized" today. It's just too bad, as many others here have said, that these idiots are taking perfectly good vintage cars and ruining them, rather then getting them from the junk yard as in the old days like they should.