Kody, I would probably put down some of the lip sync "live" performances down to that most of them were for tv gigs. Carting a mixing station to every performance that she did for tv, would be a logistical nightmare, as well costly, over-ridding the a/v editing of the show (there really aren't anymore live tv shows anymore ... due to some of the most shocking moments on live tv, even news broadcasts world wide are delayed for over a minute).
I got to say she gets tons of air play in Australia .... tooooons ... while you probably won't catch me singing "I want to take a ride on your disco stick", I find her songs really catchy. Her singing performance on SNL was well done, I gained a bit more respect for her ... I bet her next album will be nothing like her first (kinda like the style change between Pink's first album and the second). She's proven economically successful, so now she'll be able to do exactly what she wants on her next.