I am fairly well off doing a PHd as I live in a cheap area and my stipend easily covers my outgoings - your deal depends on who funds you.
I really dont feel 'trained' at all - after a year and a half I have had no formal training - it is a development of skills rather than learning how to do 'new things'. Plus it is a damn hard job I work nearly every weekend and long hours with no recognition. Dont do it lightly!