Isn't it simply a question of competition? If some advertisers can't support HTTPS, that means there are fewer bidders for HTTPS content. That should result in a lower price.
They are also bidding on what's presumably a shrinking pie of HTTP ad space. If the volume available to buy has dropped considerably, that may also be driving up the price of HTTP ad views.
Yes. But this very effect should drive https adoption for the advertisers. The grandparent comment was exactly wondering why this doesn't seem to be happening (enough).
They are also bidding on what's presumably a shrinking pie of HTTP ad space. If the volume available to buy has dropped considerably, that may also be driving up the price of HTTP ad views.