I've got no idea what 1.8 means, nor really care, but what does a really popular show get? (something like CSI or House)
...Well if you really like the show then you'd have to care because numbers determine whether or not the show continues.
You know, I think a lot of the problem too is the advent of technology that hurts a lot of shows. Tivo, Satilite recorders-a lot of people tape these shows so their vote doesn't get counted...or is it just the folks with Neilson boxes? My friends love BSG but rarely watch it first run. Their recorders are so full of crap that sometimes it takes a week to get to watching the show from watching all the other stuff.