over charging is just being a crook. after a decent profit is made and over head is covered that is it. we have some companies here that will try to suck customers dry. IE...ran an estimate for 60amp up grade to 100 and full re wire all walls are open and utility has allready removed over head lines. big name contractor bid this around 11000( over charge) local hack bid this (1600) low balling is doing work just to be doing it and not worring about profit or overhead or even keeping a roof over your head. I some times an accused of lowballing but I fill real comfortable with what I ask for jobs and on some profit is more than 50%