I think CC overstates the timing problem, and what it takes to repair it. It is common to find double action Colts that are out of time, but it does not impair their function much since pulling the trigger always pushes the cylinder into lockup before the hammer falls. Brisk cocking will also cause the cylinder to roll to lock up from inertia as well. Usually, all that it takes to fix the problem is replacement of the hand, or stretching of the hand. I have fixed lots of them over the years and it has never taken more than a hand.
I agree that the modified NS is worth little, except for parts. (Since no mention is made of it being out of time, the hand would be of value to someone like CC!) Such guns are what make unmolested examples worth so much. However, after seeing a chromed military M1911 bring many hundred dollars on one of the auction sites, it proves that there are fools out there with strange tastes and values. I would not buy it unless for parts.