I was just trying to point out the only "policy" I know of regarding signatures and value influence. Which is a little weird when you think about it. There are lots of ways folks have verified signatures on things in the past, musicians, artists, actors etc. Some game designers do signings like the MGS stuff I have signed, but I guess that it's tough enough to verify most people's signatures that VGA would rather not bother trying. They actually lower the value because it's written on.
Now I'm never planning to sell my signed MGS3... but it's awfully funny to me that something they ought to be able to verify, they treat as damage because they don't even want to try. It's weird enough seeing rarebucky try to sell something he doesn't have wrapped up in a VGA case.