I think a high reserve price is actually a really neat idea - you'd think that might have the knock-on consequence of reducing the attractiveness of adblockers,

I think a high reserve price is actually a really neat idea - you'd think that might have the knock-on consequence of reducing the attractiveness of adblockers, and furthermore of reducing viewer fatigue (so that the ads you do show have more impact). If you're smart enough, and take into account the "damage" to your relationship with the viewer when choosing an ad (i.e. aiming primarily for the ad the viewer is most likely to appreciate, and only secondarily other effects such as how likely they are to click and how much the advertiser is willing to pay), you might even be able to make ads the viewer actually wants to see; which in the long run is probably a very good place to be. I wonder if part of the reason that never happened is simply that ads are in a sense "reserved" layout space that need to be filled consistently and cannot be filled later on (due to layout jumpiness).