it's not really a matter of stupidity, but rather that most programs only tell you the percentage that the video will be compressed, so that's the only thing that automatically enters everyone's mind. as far as i know, none of the available transcoders report the average bitrate, and the only CCE frontend that i know of that reported the average bitrate was ReAuthorist (which is part of the Big 3 method, and which is explained at doom9 if anyone's interested in it, although it's not as automated as dvd rebuilder).

i don't think there's any way to load up more than one vob at a time with bitrate viewer, although if you really wanted to, i guess you could combine all the vobs into a single vob before passing it on to bitrate viewer, but that takes the extra time to combine the vobs in addition to still running it all through bitrate viewer. as for the ifoedit bitrate calculator, i was referring more to a program that directly analyzed the bitrate (instead of something you had to calculate manually).