Metaphors.
Some cars are terribly high maintainance; finicky little sports cars that require special high-grade gas, hand buffing, auto mechanics with doctorates..... My car is also high maintainance. It is a 1990 cocharro that requires that at least gallon of coolant, and a wrench be kept on hand at all times. (It also requires Mardi Gras beads, pukka shells, and a Virgin of Guadalupe air freshener hanging from the rear-view, a working cellphone, and a current membership to AAA.)
Some people are high maintainance, and just like cars, there are two types. Sports car people act like their mere prescence is a gift. They need to be wined and dined and flattered. They are rock stars, divas, and CEOs. The people who are like my car cling. They need constant reassurance, praise, and approval.
God, please keep me off the high maintainance list.