Every time people discuss a 'barn find' I think of this analogy:
"Not driving your Ferrari to keep it mint, is like not having sex with your girlfriend so she's better for the next bloke".
I'm of the opinion that any car that sits around for 20+ years is going to be more issues than one which has been looked after. You would need to replace about every cracked and dry seal, hose and rubber on the whole vehicle- much of which will be very expensive / impossible to get in the sort of time frames these 'barn' finds surface.
Furthermore, There is the value proposition of a vehicle. I personally don't get enjoyment looking at a car. I use them. I suppose other's are different, but buying one to look at it and wash/polish it that much that the paint falls off is not my thing.
-Mitch
'El Burro' 2012 Defender 90.
Bookmarks