I just went back on eBay, and search (Batman 497 CGC 9.8 or amazing spiderman 129 cgc), both resulted in only 90 days back, can you show what option you used to pull up data from last year?
I think eBay sold items only goes back a few months, whereas Covrprice gives you details going back more than a decade, enabling subscribers to track value over time. It also:
calculates current FMV for each grade of book
offers a database to save your collection and calculate its entire fmv
enables easy comparisons between different variants of the same book
it recently added fmvs for raw books
Not trying to sell Covrprice, but it works for me. Here’s a screenshot of a page for Fantastic Four #52
I think that listing is a fluke. I’ve done several other searches that only go back to the beginning of March. So you guys are right. Just a few months worth of sold listings.