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 I won't argue any of what you just said bc it is true.  Just found it interesting since I ran through some bulk today and had to go back to upload some Diamond Kings from 5 years ago due to the small in-demand amount of HOF DK cards and retro variations I found.

 

I think it says that the majority of collectors / members on TCDb just collect base. or perhaps Everything Topps flagship.  but a rare insert / parallel from Panini has little demand here.  the marketplace for a rare Panini card insert / parallel is COMC and ebay.

It would not be an attempt to upload "hot" cards, more of an attempt to minimize of a glut of cold cards. I doubt I would even have a top 100 hot card to upload. But I do see your point how that would/could manipulate the stats

As someone who is a set builder I love the idea. IDK how practical it is but the idea is great. 

The reason I think the idea is great is becuase if I see a card that has more demand then supply then I can go after it knowing that it is theoretically going to be harder to get. Plus the active traders are probably not going to use that to demand more premium on a card. 

I also like the idea of only showing for active members who have logged on in the last 3 months. This allows you to see the most up to date numbers becuase as a person we may take a season off. 

The only reason I do not know if it is practical is because there are people that would scoop up as many of the harder to come by cards and request a higher premium. 

I believe the missing data is what someone has to offer for those. It takes two to tango. A Willie Mays RC may be in high demand, but how many can actually offer anything for it?

The purpose of the stat is not to predict value.  It is to track scarcity or lack there of and specifically at TCDB. 

Like sportzcommish said,  I don't have a 52 mantle on my wantlist even though I would like to own one because I don't have anything that I could give in order to get one back in a trade.  You may see a similar phenomen with rare inserts.   I think if this stat existed it would make it easier to confirm or deny your suspicions about those type of cards.  

" The only reason I do not know if it is practical is because there are people that would scoop up as many of the harder to come by cards and request a higher premium. "

The beauty of a free market is the seller is able to set what price (either in dollars or trade) for their goods.  The buyer determines if they are willing to pay the price.  The bottom line is if you charge too much, you won't get any sales.