If you'd like to better understand the different compensation levels available to motion graphics designers, there's a good report that was just released.
The report analyzes different pay available based on experience, job title, and region worked. There's also good data about tools used (software and hardware) as well as working conditions. As they say, knowledge is power... and the report offers a good glimpse into the factors that can influence better pay and working conditions for designers.
The Motion Graphic Design Census is an unofficial web-based survey written by Bran Dougherty-Johnson and Jake Sargeant and hosted by Motionographer in 2009. Whether you're a designer or a business owner, this is good data for benchmarking.
The 2010 Census is available now.
The 2011 Census is currently collecting data.