USED RECORD GRADING- What's the Problems?

There seem to be many disconnects and bad experiences between sellers and buyers. Would the secondary market benefit from a new, and revised, grading system (beyond the Goldmine standard) that combines a visual-grade and a play-grade? Also, would it help to have grade tiers that are more granular like is used for coin and stamp grading? Or will this market have to rely on trust in the seller? Let me know your experiences and thoughts.