Actually it turns out the old whistle scale had a glitch. It was giving silver whistles when a user had 10 positive whistle points! Meaning, you mark 10 reviews as abusive and you suddenly have a silver whistle. However, to get gold you would need like 13,000+ whistle points. This was obviously screwed up.
We now have a fixed scale, meaning once a user gets enough positive points they will advance to a better whistle. They won't lose that level unless they get negative whistle points from flagging non-abusive reviews, etc.
So some of you that had silver whistles didn't really deserve them yet. Now you have to keep working to get them back. We are going to adjust the new scale a bit to make bronze and silver a little easier to get. We will now have more people with gold and diety whistles though.