1g of Xylitol is enough to kill 3 dogs in half an hour. It's the kind of stuff most people can't keep in their house. If you spill your soda, your dog runs over, laps at it, and then is dead in half an hour.
If you drop your chocolate bar and the dog eats it. Same story.
DJVU was another contender but it just happened to be tagged on to a PDF-like docuemnt format and not widely known as just an image format.
Finally, anything that was not (properly) supported by Internet Explorer ten years ago was a dead duck. And Microsoft and Apple actively snub any open format if they can get away with (like Vorbis, WebM etc).
MS Office is definitely one of the apps places like PC World try to push at the checkout.
I remember seeing a documentary about leaked details of satellites that could read the headlines off a newspaper in the early 1970s, but they would have had very low orbits and didn't stay up long, mainly because they would run out of film.