It is an interesting metric, but there are a lot of reasons why you can't necessarily draw conclusions from this alone. For example, each person's marketplace presence. Phillipma has a pretty large presence in the computer hardware section (if I'm not mistaken, I'm not looking up post history now, just recalling this from memory), Ognasty and Blazed in the Collectibles sections, myself in the Goods/Collectibles sections, and the others not as much.
I'd love to be active in the domain name sales section. Unfortunately there isn't one, and digital goods is full of stuff that gets bumped but doesn't appear to sell.
The sale of vitual assets, and the acceptance of Bitcoin in settlement, is one area where trust could be really helpful.