The following article talks a lot about the value of specific comic books. For the sake of full transparency, and getting the dry stuff out of the way as quickly as possible, the following should add just the right amount of context:

This is not data that Rally uses for official comps of comic book assets; It is data pulled for the sake of this article and it comes from the following sources:

EBay: EBay sales were searched starting in early October 2022, concluding in early November 2022. These sales roughly cover February/March through October, these sales reflect a very specific window of time. In eBay searches, keywords included issue title, issue number, and “VG,” which indicates that the seller believed their comic book to be in “Very Good” condition. This is a subjective view from the eBay seller, and not related to any grading service’s analysis. In some cases there would be multiple issues for sale, and selections were made based on photography and metadata that were most reflective of a VG condition book. What is less subjective about these numbers is that they reflect actual sales, which is something price guides haven’t always used as a baseline. Again, all of eBay sales took place in a specific window of time in late 2022, immediately before or immediately after sales could hypothetically be very different.

Heritage: These prices reflect Heritage record prices, which come with a number of caveats. For instance, an issue that might have only slight popularity might have an official CGC grade of 9.9, a condition so good it is almost never seen, even among brand new comics graded immediately after purchase. If another issue, say a more valuable issue, went on sale but was rated 9.8, it could be sold for a lower price than the less valuable issue that was graded 9.9. Think about it this way: There may be a single known copy of a 9.9 graded issue known to exist, where there could be five hundred copies of the same issue with a 9.8 grade from CGC. 

During this data collection process, it appeared that some issues had never  been sold on Heritage’s auction platform, and to replicate value in these cases, a secondary eBay search was initiated, recording highest recent sales of pristine, graded versions of comic issues that could be seen as more reflective of a high grade Heritage sale than any other available options. Some comics may have only seen a sale once or twice closer to the early 2000s than present day, but there were few/negligible numbers that reflected an older date corresponding to an impactfully higher price.