Evidence?
Gpa
But I sold a ST110 in 9.0 back in August for 4X the GPA-recorded high. I believe that sales of other grades since then simply reflect the proportionate price increase that had already been realized. Put another way, I think GPA is a trailing indicator of the market on this comic. What sales since then have indicated that prices on the comic keep going up, rather than simply catching up?
The same thing happened with Hulk #1. After the 9.2 copy fetched a record price at auction, sales in the lower grades followed suit over the next couple months. Now, they've taken a breather, and each new copy to market no longer tops the last one sold in that grade.
Comicconnect also sold a 9.6 recently for 66k which would be the new high for that grade. In another year or so, 66k will be a gift.