Monday's hot topics - Why do volunteer work??

On the forum 'Mark P' raises a good question about why we should even be involved in volunteering to make society a better place:

Many people judge me and say I should be spending more time helping with the community or giving back to society. For what? I don't remember society giving me anything...Where does one(you) draw a line between giving back and taking care of yourself? Do you consider this to be selfish? So what do you think about this?

Interesting question. What's your reason for helping out and volunteering?