Originally posted by hoojammyflip . Just that if an average price is being calculated somewhere in the html jungle, then a median would be just as easy (instead of sum/N its the (N+1)/2 price when the prices are ranked) to calculate, and would filter out moronic prices being occasionally slapped in.
Since most lenses have between 5-20 reviews, just scrolling down the list gives people a decent idea of the prices that people paid and from there can "weight" them as they see fit based on the reviewer's description of whether they bought it new, got a great deal, etc.
If people were really interesting in determining current market value for used lenses, I suppose you could add a couple line to the marketplace feedback process that would allow you to enter the final price paid for a lens and link it directly to the lens data in the review section. That way a running list of the prices lenses sold for, and the date they sold, would be more easily accessible. Obviously this would only capture lenses being sold on pentax forums, but you could also make a provision to add price data for outside transactions, even if the buyer didn't want to leave a full review.