I agree, a seller is free to ask any outrageous price for an item, a knife in particular. I am reminded of Levine's guide to the value of knives. Knives themselves have no value other than what a buyer is willing to pay for it. One example:
http://www.ebay.com/itm/SCHRADE-OLD...973?pt=Collectible_Knives&hash=item27ceb5ceb5
The knife is priced by the seller at near five times what the market currently values it, which is his perogative, even though the odds of it selling at that price are just slightly above nil. By contrast, the knives you have for sale are pretty much below market prices, below what I as a collector would expect to pay if I were looking to purchase those particular knives. One seller is obviously motivated to sell and aware of what the market will bear, while the other is not.