I'd only give the slightest creedence to Ed's comment if he had said something like, " After I essentially steal a gun from your widow, because she was scared of it, and I had convinced her of it's low value because the stock had been cut down,...Then I could scab somewhat matching pieces of walnut on the chopped stock, and make a little money off somebody."
Then I might agree, because well, "The money in guns is made on the buy, not the sell."
But there is no collectible shotgun, of average rarity, that sells for more with a scabbed upon stock, than one that was original.