Not seeing images is better than not seeing the page at all. People who block content know that things sometimes don't load. There is no reason to block loading of the pages for 8 seconds.
You're probably not their target audience anyway (read ad money stream) so they don't really care if you have to wait on content or don't see it at all. Google et. al. just see you as a parasite on the system.
It seems like the AMP delay is there to punish people who block that JavaScript loading from Google's servers. I can't think of another reason why there would be an 8-second delay for any user of a technology that (dubiously) is supposed to be about speed.
