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I know some professional people that would add in the charge to the customer for the four hours driving on top of the work they do and when their customers complain about that quote they are bluntly told beforehand "take it or leave it" but since they are highly skilled and very good at their job they still invariably get the work order as its still cheaper getting it done right compared to previous contractors that maybe have right royally stuffed things up and then cost them a lot of money to rectify.