I think you just posted your rating...
Knives cannot be rated like baseball cards, they're more like used cards. If a knife has never been used it's NIB. If it has been fondled and used to cut a piece of paper, it might be like new. Beyond that, knives are used. Pictures are the best way to show a potential buyer what condition the knife is in. If the knife has any problems (Horizontal or vertical blade play, uncentered blade when closed, worn lock, stripped screws, etc) that are hard to photograph, that should be stated in the for sale thread.
Properly documenting the condition of a knife is beneficial to both the seller and the buyer. If you sell this on BF.com, we usually play by the rule of the deal is not done until both parties are satisfied. This means if somebody buys a knife and feels it was not accurately described, they should be able to return it for a full refund. I've been stuck in a few trades where a knife was not properly described and the other guy traded away my knife before the deal could be reversed... Needless to say this is not a good situation.
Serrated knives generally sell for less than plain edge knives because many knife users will only buy plain edge (I don't own a single serration in my collection of 50+ nice knives).