The satisfaction is mine: revenge seeking following extrinsic reward.

The extrinsic reward should impede revenge-seeking if revenge is solely driven by the desire to feel gratified. Study 1 ( N = 114) showed that satisfaction from receiving monetary compensation decreased thinking about getting back at the provocateur. However, Study 2 ( N = 213) found that insulted participants aggressed against their partners despite fulfillment from receiving the unexpected monetary reward. This evidence indicates that gratification is insufficient to impede revenge following provocation, suggesting that avengers want to feel pleasure when retaliating and want to balance the scales by sending offenders a message.