A lot of people believe that is why so many of the older ones that are a color other than black are chipped & pock-marked.
For whatever reason, you tend not to see the black ones in as bad of shape. Maybe they don't get damaged as easily, or maybe they just tend to get scrapped quicker than the other colors when they get all pock marked.
Personally, I probably wouldn't do it unless the kettle was already pretty roached or if it was basically a common black one of no interesting vintage.