I recently watched the Mile High II CGC 10 copy of Thor 156 sell for a staggering $37,200 on Heritage Auctions. I had been looking to upgrade my 9.4 to at least a 9.6 for some time. Thor 156 is common in high grades similar to Thor 132. Not that hard to find. Seeing that copy, it lit a fire under me to finally get an upgrade. I managed to find a 9.6 on a dealer site for $210 but he had a promotion so I got it for $158. I'd love to have the 10 but for 99% of collectors it's not going to happen.. Now while common in high grades the 10 is one of only two from the 1930's to 1974. An 8 page promotional comic is the other 10. So I'm happy the CGC 10 came up as it motivated me to get my upgrade.