I think there's a problem. If you pay each user a fraction of what they're owed, in proportion to what they're owed, nobody ever gets fully paid out until everybody is fully paid out - and that never happens.

See http://en.wikipedia.org/wiki/Zeno's_paradoxes#Achilles_and_the_tortoise for a related paradox.

This means you never complete anyone's 150% cycle, and never get paid yourself.

We can work various examples, but suppose every day you get 1 new person depositing 1 new BTC.

day 1:

A deposits 1 and is owed 1.5

day 2:

B deposits 1 and is owed 1.5. We'll assume B doesn't get paid from his own deposit, so only A is owed anything from B's deposit. A gets B's whole deposit. A is owed 0.5 and B is owed 1.5

day 3:

C deposits 1 and is owed 1.5.  C's 1 is split between A and B in ratio of their credit: 0.5:1.5 or 1:3. So A gets 0.25 and B gets 0.75. A is left being owed 0.25, B is owed 0.75, C is owed 1.5

day 4:

D deposits 1 and is owed 1.5. D's 1 gets split 0.25:0.75:1.5 or 1:3:6. A gets 0.1, B gets 0.3, C gets 0.6. A is owed 0.15, B is owed 0.45, C is owed 0.9, D is owed 1.5

and so on.  A's balance goes 1.5, 0.5, 0.25, 0.15, ... and gets lower every day but never reaches zero.

Get it?