Yeah, it really is one of those things you either sit through for an hour and understand or you don't.
No it's not!
Hey, let's explain it in terms of toilets!
If you have recently flushed a toilet, and the tank is filling up, you can usually flush it again when it gets to about half a tank, but the flush isn't as good. However, if you wait until it's completely full, you get a better flush. If you wait for ten days, the tank still isn't past full, and the dude who's been flushing half tanks twice every minute is way ahead of you.