It is the lack of collecting culture over there that is the difference. Buyers are going to use a gun and will invest in regular maintenance or improvements. In the US there has been a group of buyers who are obsessed with owing as near to original mint condition as possible with no interest in shooting a gun because from their viewpoint wear destroys a guns value. I know of Browning and Winchester who will buy a gun based on high original condition but would never think of shooting it. In fact many never shoot at all anymore.

As to re-case coloring it has gotten a bad rap in some circles. Colors not true to original colors and the possibility of warping the frame are seen as reasons many here no longer want to re-case color guns. But I always thought a owner was free to do what ever he wanted with his gun.