Most people who buy this single will have already bought Frances the Mute, which has "L'Via L'Viaquez" in its complete form. There won't be much appeal in owning the radio version that I can think of, unless you are a completist. The accompanying music video is definitely a trip, but not so much innovative as well-marketed. I don't see as much true creativity in it as I do in the videos of other progressive artists who have attempted to use music videos as a means of visual expression (for instance Tool). As for "The Bible and the Breathalyzer", it's essentially a spoken word piece. Interesting, but certainly not a true supplement to The Mars Volta's catalogue of studio recorded songs as it doesn't seem to occur in the context of a particular theme, even that of "L'Via" (although this is arguable).
In short: collectors and die-hards only. This is not essential material unless you absolutely must see the music video.