If you are helpful and friendly to everybody it will catch up to you. You may not get to be a different color, you probably wont get a special sign by your name, but you have the satisfaction of knowing that you've helped people. This is the interent for fuck sakes, if a bit of satisfaction isn't good enough for you then you need a life.
That said, I've been on here for a few months under two years, and I know most of the people who have the tendency to be helpful. If you hang around and are friendly and helpful you dont need an icon for people to recognize you.