Why do people help others for free?

So I was reading a post on p5's asking questions about sngs and a well known user that knows sng's very well posts a detailed response, with links to ICM programs,etc. Now I know we all want to help people, and its really in our nature, but do we not play poker for profit? I really think alot of these "helpers" are naive about the poker economy and the game itself. The bottom line (especially with SNG's since they have the flattest learning curve) is games are getting harder, and people offering free information are just burning their own money. I also see this alot with MTT'ers, especially the more sucessful ones who think their profits won't be hurt. That's pretty ridiculous to think people cant learn to beat high buy in MTTs - I don't think you need a natural born talent to beat MTT's of that nature, just alot of studying and dedication. I also see alot of people responding to posts to stroke their ego - show the new player how much they know and how good they are. Thats great but really put your wallet before your ego. I have to admit I use to tell people how bad they played, etc - it was immaturity and now I definitely stem away from any negativity about someone's game. So in conclusion I would like everyone to think twice next time they post useful information either in an IM, forum, etc. Sure we love to help people, its in our nature, but if your playing poker for profit your hurting yourself in the longrun.