I don't see it as having so much to do with the price of the item. I wouldn't attempt to sell a dog with unclipped toenails and matted fur, or a chicken with poop stuck on its back feathers.
To my mind, the snake scene actually has a lot in common with selling jewelry (esp. with the way BP "pet rocks" get stored away in drawers). The prices can go very high, rarity may be coveted as much as beauty, subtleties in color and pattern get people excited.
A pretty quartz crystal should be displayed as fingerprint free as a high quality diamond.