But something tells me those live wallpapers, along with just about everything that goes on within the Android system, kill your phone in a matter of hours.
Correctly done live wallpapers (I've written one) have minimal effect on the battery.
They usually only run when you're actually looking at a homescreen... and that's not that often. Normally you turn on your phone, look, find some info or start an app, and you no longer see the background.
Of course, it depends on the wallpaper. For example, one that simply changes static backgrounds can use as little as 15 seconds of CPU time a day. At the other end of the spectrum, an unusually interactive one could use 15 seconds of CPU every minute of viewing, but again how long are you actually looking at your homescreen each day? A few minutes at most?
To cause battery issues, you'd have to sit there keeping the screen alive just to enjoy a background animation... which people tend to do when they first get live wallpapers ... but that's conceptually no different than sitting and watching a video or using a game app which would also use battery.