Anyone with greater than 50btc should get nothing. Or give those with the least BTC the most BB. That would be interesting. Or take the average and the further from that average the less you get. I'm sure someone as smart as tonych obviously is can think of a myriad of ways to distribute in a fairer manner.
Nice suggestions

"give those with the least BTC the most BB" is especially interesting... Sounds like a citation form "L'Internationale"

Others are somewhat less trilling, but a bit more realistic though...
I really like the idea, but unfortunately such smart tricks will work only for the first distribution...