14. The computer-based recommendation system of claim 1 , wherein the condition score further represents an estimated preference impact based on at least one status attribute that may affect the user's preference for the unique item.
14. The computer-based recommendation system of claim 1 , wherein the condition score further represents an estimated preference impact based on at least one status attribute that may affect the user's preference for the unique item. 15. The computer-based recommendation system of claim 14 , wherein the at least one status attribute describes at least one of the following: a listing price, a geographic location, a type of seller.