Before I make my suggestion, please know that, for several reasons, I oppose the use of valuations on Numista at all, but I understand that many readers come to this website and join for the exclusive purpose of determining the value of a coin or banknote. Numista's attempt at crowd-sourcing values in the catalog seems not to serve the aforesaid purpose. Beyond my complaint that the values published here inherently suffer numerous forms of bias, many users who seek valuation are:
(a) unable to identify the coin or banknote in question, or
(b) unable to determine a grade or range of grades for the same, or
(c) unable to determine the authenticty of the same, or
(d) unfamiliar with the range in value across multiple sources (Greysheet, Bluesheet, Krause, auction sales, retail, wholesale, etc.), or
(e) otherwise in need of our expert opinions.
Thus, I propose that:
(1) Numista create a big, fat, shiny button in the header for HOW MUCH IS MY COIN/BANKNOTE WORTH?, and
(2) said link leads to a form where users can upload pictures and info about their coin or banknote, and
(2) Numista enlists a battery of qualified collectors from among its most trusted users, and
(3) said collectors respond, in real-time, to users requests for valuations.
Of course, every valuation would come with all the necessary disclaimers, explanations of where and how to sell an item, and notice that the valuation is not a solicitation to buy the item. Whew! It's a lot to swallow, but why not? We have 100,000+ collectors here, including many hundreds or thousands who actively post in the forums and buy and sell coins on a regular basis. Put that knowledge base to use in a constructive, educational system. Perhaps Numista could allow those users to then list their coins or banknotes for sale here on Numista, at the value suggested during the valuation process. It could be a uniform and controlled extension of the swap process we already use, and would eliminate the many sale listing we see in the swap forums anyway. Otherwise, we're just turning away many thousands of users and potential users every time we tell them to check ebay etc etc.