"It does not pay to be the nice guy at work. Being agreeable is correlated with lower earnings for both genders. That may be because being agreeable is associated with being passive. It’s all the more surprising, then, that being an extrovert does not have a significant relationship to wages, for either gender. But being an adaptable employee is consistently rewarded. Workers open to new experiences tend to receive higher wages, regardless of gender."

Economist.com