What's really interesting if you study the philosophy of altruism is that some people believe the only way you can actually do any kind of selfless deed is if you get absolutely nothing from it, not even the self-satisfaction of having done a good deed.
If your brain gives you happy tingles when you help someone, you're still getting something out of it. Therefore, only miserly curmudgeons who don't want to help but feel obligated out of a sense of duty can truly commit selfless actions.