I can show you a Winchester 1895 leveraction rifle convered to 45-70 (I believe) that started its life as a Russian musket, fully stocked, with bayo lug and chambered for the 7.62x54R round. It sold for $500. Had it been original, it would have sold for $1,200-$1,500. Subtract the money spent to sporterize (including the new barrel) and tell me where the guy came out ahead. Even 95's with bad bores go for significantly more than $500.
The mentality behind sporterizing a military rifle (and the majority are hack jobs, everyone has to admit to that) is the same that "modernizes" old houses. The Stephen D. Lee home in Columbus, Mississippi, was an antebellum Greek Revival home that had been sold with all furnature and contents since prior to the War Between the States. You could read books owned and read by generations from the past. It was called "White Arches." 10 years ago, it was bought by a trucking company owner, whose wife decided to improve on that home. She knocked out walls, put in doors, and painted/papered over original hand painted walls (like wall paper, but the design painted directly on the walls). They sold off furnature and books, so that in but a few years, the character of the home had been forever lost. The people then didn't even have the common decency to stay in the home, but sold it when they were tired of it. They moved in, destroyed, and left. That is Bubba. That is what he does. And he is far more prolific than any master craftsman mentioned here. And he destroys truly rare pieces over and over again. I have seen his work. Very rare rifles "improved" with synthetic sporter stocks, chopped barrels, and the like.
Ash