http://comics.gpanalysis.com/default.asp
They track sales of CGC'd books... site has market reports, and up-to-date info on auctions, breakdowns on yearly averages, highest/lowest price, and all this for each grade, across a vast amount of books.
Come to think of it, yeah I think they do... but I think you have to be a paying member of the "Collector's Society" or whatever they call themselves. It's been awhile since I was over to their site. I've only got one of those "free" memberships that they were offering a few years back.
But getting back to
bchat's post from yesterday. The problems I think you're worried about stem from the two systemic problems in the online auction processes we have now.
(i) The auction systems are "value" based, not "transaction" based... in other words, unlike when one goes to sell stocks on a stock exchange where you pay a flat fixed fee for the transaction, when you go to auction off a comic you pay a fee based on the value of the book (in addition to a transaction fee). This can indeed lead to price rigging if not regulated carefully.
(ii) The second inherent flaw is that when you go to a site like ebay (and even Heritage to some extent) to auction off (or buy) a comic, you enter into "a" auction, not "the" auction for the specific item. In other words, unlike when you go to sell a stock on a stock exchange where there is only one never ending auction for that stock, here you enter one of many such auctions... each potentially with its own set of buyers and sellers, with their own bids and asks. In order for there to be a real, meaningful "quote" and/or closing price, a single auction space must be established (or through mergers of competing companies, emerge) with auctions for each individual comic "type" (one for each title, issue number, and condition).
Ebay was not established to sell comic books, it was established to sell general merchandise... ceramic beaded indian bracelets, "Bolex" watches and ones unwanted castoffs. Basically, it's a glorified garage sale... where people come "hunting" for "bargains." It's rife with charlatans and crooks (both on the buying and selling side), and many uninformed, gullible dupes. Right off the bat, it's perception in one's eye (at least my eye, anyway) is not that of a place concerned with efficiency in the pricing mechanisms it employs, but of getting as much "stuff" sold as possible in anyway possible. But then neither is Heritage that much better it appears at the "efficient market" game... here we have a high end auction house where the dupes have bigger wallets, but are still dupes nonetheless. At least here the sellers
know what they're selling and most of the time they treat the merchandise with the respect it deserves. But somewhere between these two extremes is the truth... that is, the true value of what comics are worth as an investment.
For meaningful, fair, data on comic book values to be realized, a trading system has to develop where comics (and only comics) are traded regularly in a single never ending dedicated auction space for each "type" of comic ("typed" by title, issue and condition). And trading fees are fixed and "transaction" based.
How does one get there from here... the first step in this process is to adopt an unbiased independent set of standards on the grading of comic books with regard to condition. We almost have that with the CGC. Then an auction system must be developed devoted only to the exchange of comic books. Then this auction system must become the accepted exchange for all or almost all such transactions.
Overall, a very large task indeed in my opinion. And we may never get there if people continue to delude themselves into thinking there isn't an "investment" aspect to their comics.