"In order to curtail potential abuse of membership privileges associated with the forums, questions regarding valuation of knives and collections are limited to those with a membership level which permits selling on this site. Accordingly, registered and basic members may not start or post in threads with such requests whether with the intent to sell or for informational purposes only."
You will also need a gold or higher membership to sell here. It's all in the rules you agreed to when you signed up.
~Chip