I understand the general trend--I just thought it was interesting how much they've dropped off in the last 6 weeks or so. I've followed Hall and Glebe listings pretty closely since I started getting into sketches last October and they've been fairly steady, obviously some outliers here and there. But the recent trend down is pretty pronounced.
If we're going to put a product to it, seems like the Glebes and Halls really started to fall with the last Batman product. Maybe that established a trend that blended into their past work.
My sketch collection: http://sketchcollectors.com/gallery.php?user_id=727
I'm offloading my sports cards for cheap. Check out MonkeyLots in a B/S/T forum near you!