Inheritors suspect their successes are due to wealth and position. It's hard to be sure they have achieved anything, or are really liked by others. They are stung by others' resentment of their good fortune. Fear of failure runs high among inheritors, especially if their father has been a huge success. Lack of motivation.
Available wealth makes it hard to stick to goals in the face of setbacks and frustrations.
Sometimes inheritors' goals are ill-defined, particularly career goals. Inheritors are not driven by life's necessities. Their motivation is often short-lived and lacks intensity. Self-discipline requires focused and sustained energy, as well as postponing gratification for ultimately higher rewards. These virtues seem incompatible with the silver spoon.