Pupperino, you can't "recycle" an old boat. You can send it to the breakers, you can scrap it, you can restore it, but there's no way to "recycle" an old FRP hull. Economically or not.
Throwing good money after bad is simply foolish, FRP resins and glass will always be available and if the market cost of new is cheaper than salvaging old, that's what you do.
You may have had good luck stripping some old bones or scrapping them. There's certainly *some* money to be made that way *some* times. But as a practical matter?
By the time a boat is being given away, it usually will cost twice as much to repair and refit, as it would to simply buy a functional boat. The folks who fall for a "free boat" usually are newbies with little or no idea how expensive all those repairs will be, and many get badly burned. If the boat was worth the price of the match and pint of kerosene needed to burn it...the PO would have put it up for sale instead of giving it away. (With the really rare exception of "Oh, my uncle can't get out of bed anymore so he's giving me his boat" and such.)