The topic of "how much is it worth" and the EE was discussed by the moderators some time ago. It is obvious that some members abuse such valuation threads, using them to promote items which they are selling. Promotion of sale items outside the EE is discouraged. Some members try to run auctions when advertising an item, also discouraged.
If there is a valuation thread, and the item subsequently appears in the EE, the thread may well be removed.