I'm solidly in the save the patina camp. An even gray coating with little or no black spotting is pretty rare and you've got one. I was lucky enough to get one once too and also lucky to be brought round to see the value of it.
Wow! That's Beautiful! I'm affraid mine might have a couple of little spots on the toe of the second picture that may be rust forming. They look a bit red to me. How would I go about removing that without ruining the patina?