Ok, how does this makes sense? The relative savings are interesting, not the absolute.
Tried the open source PackJPG ( http://www.elektronik.htw-aalen.de/packjpg/ ) I just ran on a few images. It says avrg. comp. ratio : 78.28 % . And the author answers (my) emails and didn't scam me.
/edit: ok, i don't get what their software does. It is not a new codec, so is it possible that their software is superior to imagick convert -quality 85 ? Any technical details? The whole product seems highly dubious. The PackJPG thing is "lossless" as it does can restore the original jpg.