From Bladeforums rules:

WHAT IS MY KNIFE / GADGET / SPATULA / TUNING FORK WORTH ?!?!?!?!

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. This rule applies throughout the site.

In other words, without a paid Gold membership, you don't get to ask about sale values. Too many people abused this question to hint they had a knife for sale, which you need that membership for.