1. There is absolutely such a thing as greeks for 4 years vs. greeks for life. I know so many people who have just dropped off the face of the planet after graduation as far as their GLO's are concerned.
2. Never had the conversation per se, but I had a pretty good idea which of my sisters would continue to be involved on the alum level and which wouldn't.
3. Sometimes you can tell, sometimes you get surprised.
4. To cut a long story short... I came to it by a circuitous route, but I'm a lifer.