"that pays whom holds"
I don't understand. (...)
Let me try to explain it a little bit more:
I just suggested a kind of bomb that you get paid the value accumulated in jackpot only when the bomb explodes (countdown times up) and you are the last holding it.
Example of reverse coinbomb (10% Interest & 1.25x Multiplier & 1 BTC Jackpot):
1) McCartney first buys the bomb for 0.1 BTC;
2) Lennon buys the bomb (before 24h countdown) for 0.125 BTC (McCartney gets paid back 0.11 BTC);
3) Harrison buys the bomb (before 24h countdown) for 0.15625 BTC (Lennon gets paid back 0.1375 BTC);
4) Starr buys the bomb (before 24h countdown) for 0.1953125 BTC (Harrison gets paid back 0.171875 BTC);
5) Ozzy buys the bomb (before 24h countdown) for 0.244140625 BTC (Starr gets paid back 0.21484375 BTC);
6) 24h countdown finishes without any additional purchase and the bomb explodes. Ozzy wins the jackpot prize of 1 BTC or + (there could be a progressive jackpot that increases itself with every additional buy)!
That's it!