One thing that turned me off on trying to find a Masi 3V or Volumetrica is they seem to have a tendency to rust quite badly. Combine that with the mediocre paint quality (In terms of durability.) that Masi applied. It becomes hard to find examples without the tin worm problem.
I suspect that it also has to do with the alloying spec of the 753 tubing. As I have seen a good number of 753 framed bikes from other manufacturers that have rust problems......
I'd still consider though, owning a Volumetrica, if I ever find one that's in really good condition......