All this discussion brings to mind on lesson that I've had to learn the hard way........
It's a latin phrase "Caveat Emptor", it means buyer beware & was quoted to me by a policeman when I was trying to get a deposit back from a dodgy sale.
I guess it also goes along with the other idiom that says a fool and his money are soon parted.

Where am I going with this?
Well, I guess I agree in the theory of what Phunk has said..... If people are too lazy or stupid to do research into the work they are getting done & just walk blindly in then they only have themselves to blame if they get ripped off.

Where I draw the line is when someone asks a direct question of the service provider (as part of his / her research) ie/ Is the alternator broken? & the service provider responds with a blatant lie..... That's unethical & the people that do it should be in jail.