Another thing I've noticed is that HA has started putting "Signature Auction quality" books in their weekly auctions.
For example, this Sunday there is a CGC Universal 3.0 copy of Archie #1:
https://comics.ha.com/itm/golden-age-1938-1955-/archie-comics-1-archie-1942-cgc-gd-vg-30-off-white-to-white-pages/a/122007-15078.s?ic4=GalleryView-Thumbnail-071515
The following week, there is a 9.0 copy of GGA classic Torchy #5:
https://comics.ha.com/itm/golden-age-1938-1955-/torchy-5-quality-1950-cgc-vf-nm-90-off-white-pages/p/122008-112006.s?ic4=GalleryView-Thumbnail-071515
And the week after that, the highest graded copy of Batman #1 (9.6, Universal):
https://comics.ha.com/itm/golden-age-1938-1955-/batman-1-dc-1940-cgc-nm-96-white-pages/p/122009-47006.s?ic4=GalleryView-Thumbnail-071515