This issue comes up in the subject of restoring collectible automobiles and especially regarding the muscle cars of the '60s. The cost of properly restoring a muscle car can be considerable. The parts are hard to find, and the labor costs are almost prohibitive. Many who attempt to restore a muscle car go "upside down" financially attempting to restore it. It often is cheaper, and always easier, to purchase a restored muscle car. Often, the receipts showing what was spent on the restoration exceed by far the price the car sells for.
I think the situation with restoring razors is not comparable. While sending one off to a quality restorer can be expensive and can cost as much as $200 or more, doing it yourself, if you know what you are doing, can require little more than sanding and polishing the razor and making new scales for it. Larger Wade and Butchers seem to have their own market, thus the prices we see on Ebay for those that require restoration tend to be higher.