With those motion sensors, always let the customer know right away that the price includes installing and wiring only. NO adjusting.
It gets a little more complicated though when you have the wealthy customer that hires out EVERYTHING (even walking the dog) and you need a 24' extension ladder to adjust.
Then make sure the sensor light being installed is of a reputable brand (I like the Journeyman from HD) and that the price to install has enough figured in.