I read somewhere that most of the Seiyuu's dont have full time jobs.. they are only part time.. most have to work in like a 7/11 or something to help make ends meet. apparently because there are alot of people wanting to be one... there are only a handful of them who have fulltime jobs.
very true....out of every 10 000 that graduate from seiyuu specialised schools...only about 10 get to be full fledged seiyuus....and even when becoming one, you can't really be too picky about what projects to take, otherwise your manager will keep reminding you about the remaing 9990 that didn't make the cut-off.
Some of the current seiyuus have theatrical backgrounds (eg. Ami Koshimizu). So you don't really need to attend specialised schools to become a seiyuu.
Nowadays, anime studios / other employers are generally economical with their choice of seiyuus. As you can see, alot of the current series have main casts who are average or below in popularity (lower wages) and those that are high in popularity (higher wages) are usually cast as supporting characters.