As mentioned in another topic, there is a line between a collectable/non-shooter and a shooter carbine. On one end, the mixmasters (and the rebuilts) make dependable, durable shooters for everything from plinking to varment hunting to home defense. At the other end of the spectrum are the truely historically correct and museum-rare carbines which are examples an America which we will never see again - these pieces we don't take chances with shooting.
CPM is giving us all great shooters ($600). The auctions are offering rarer (but shootable) examples of things we rarely see ($2,000~$3,000). The estate sales of old war veterans seem to be giving us the "bring-backs" of what really was (priceless).
But where do you draw the line? Shooter vs too-rare-to-shoot