"Statuette: 20 gp base. Cracked: x3/4. Antique: x5. Jade: x2. Actual value: 150 gp."Benefits:1. Players don't get secret information2. Strong description/value correlation (verisimilitude)3. Attentive players can learn what matters4. In-world repairs just change the descriptors: "crudely mended", "restored", etc5. Infinitely extensible6. Use as many object classes for base value as you want7. GM doesn't need to track anything at all8. Descriptions matter more