My suggestion is simple.
Dont have single threads for topics such as this one and more importantly the "How much is my...oh wait I lost it 48 pages into this thread ....worth"
Lets have a seperate forum sections for valuations so people create a new thread each time they want something valued (perhaps with an option if possible to ignore that forum section when clicking to "view new posts since last visit")
that way people have more chance to see what has been posted, I and I am sure 90 % of people only visit that thread when I want a price on something, rarely will I just go and browse it from end to end offering any advice.
So many items get lost/ignored. in the current system, leading to frustration and then annoyance, first of the person looking for a price then of every one else on the forum when they post a unique thread in the wrong forum section trying to get some attention.
Like wise a seperate forum area would be eaiser to search for commonly requested prices such using the forum search function. At the moment if I want an estimate on ...lets say a zaskar, I use the search function, hit go on "zaskar and price" then get presented with the "how much is my XYZ worth" thread... all 900 million pages of it which I then have to spend the rest of the week scrolling through looking for a highlight....Rubbish!
Same applies to this thread, give it a year, no one will check it good ideas will go unseen and end up lost in the depths.
wow that turned into a bit of a rant