It is a good idea, BUT it is all completely based on the eye of the beholder. What is premium and what defines what that is not in every single case? There can be no pre-defined metrics for this.. it is about as useful a domain appraisal (sarcasm intended).
While I like the idea of sorting out the QUALITY from the JUNK names, it is too subjective and people would just get mad if they get a mod that ends up not seeing something as top notch, when they do. imo, it is best left the way it already is. It's not like 2,000 names are being added on here each day. It only takes a short time to go through the new ones.