many levels had about as many members as the total of those above it.

Are you looking for something like "exponential decrease"? :-)

saints tend to pile up (they hit that heavenly glass ceiling)

That reminds me of one of my favourite quotes:

Frisbeetarianism is the philosophy that when you die, your soul goes up on a roof and gets stuck.
- George Carlin

*grin*

Makeshifts last the longest.