The altruists, who dedicate years of research and learning to finding and giving freely medical or other breakthroughs to make a better world. I am glad they exist, please give them my tax dollars, but I stopped trying to fix the world around 35 years old.
The other kind is patio11 kind - sorta altruistic - but getting paid altruistic. Since my Damascean conversion at the age of 35, I appreciate this kind too - you cannot have my tax dollars but you can persuade me to buy
The world needs both kinds. Well, it needs the first kind, it will never be short of the self-interest altruism. And since his pet cause is about making me money, I like his self interest.