It is common for people to expect something in return for a favor or such. Then again, many humans expect something for nothing too. The human condition is flawed. However, I believe many, many people do things out of the goodness of their hearts, also because of karma. Sometimes you may want a favor returned and other times may not.. I guess situations dictate some of this as well. Just be good people and help your fellow man, and in the long run you will be rewarded in some aspect- just try not to expect any. It can be tough!