Blu-rays with 1080p extras? Specifically catalogue titles

[AgentOrange]

I know alot of new releases have many extras in 1080P, but as my collection has grown I've noticed the VAST majority of extras for catalogue titles are in 480p. Many titles don't even have a single extra that is actually 1080p to complement the feature film. Even when the source is clearly taken from film (ala deleted scenes), alot of times those deleted scenes are also presented in a very low res 480p image. I think it irks me most with deleted scenes.

Now I'm sure part of the reason is cost, studios are lazy/budget conscious and just want to cut and paste content from a previous DVD wherever possible. And of course for certain extras, like interviews and such, it was probably shot in SD video to begin with (not on film). How much work is it to just re-run the film elements and then digitize them at 1080P? I'm not talking clean up or remastering, but just encoding the basic image at 1080p before mass producing the blu-rays? Usually with deleted scenes it's raw footage anyway... and I'm fine with that, I just don't understand why the actual encoding of this footage can't have been done at 1080p.

Anyway, I guess the point of this thread is to find out which blu-rays have the most extras that are actually 1080p material. I'm especially interested in older and catalogue titles.