Good behaviour is not rewarded? You and I must live in very different worlds then. Good behaviour is literally rewarded to me everyday. The time you help a colleague with a problem a few times leading to them vouching for you for another job. Going the extra mile for a work project allowing you more leeway in your planning out your hours. Making chitchat with the fast food worker that you get your sandwich from once a week leading him to give you a sandwich for free on your birthday.

Of course it's not an instant reward like it is for children but good behavior is one of the things I can point to that led me to be in the position I am now.