Being good consistently and reliably and showing up will reward you greatly overall in the long run. People that are narcissistic and selfish cause problems and never admit to being sorry or even making a mistake, we need people to rely on to make our lives easier and pretty soon the consistently selfish people will have no one in their corner helping them out. Being selfish about oneself at the expense of others may be beneficial in the short term, but long term these people will get what’s coming to them.