Wanna sell me your soul?

Old school isk doubling game:
1. Send me 20,000,000isk
2. I send back 40,000,000isk
3. You send 80,000,000isk
4. I send 160,000,000isk
5. Continue to double on both sides untill someone stops.
It's a game of nerves and I love it, the longer both parties continue to play the larger the reward, but also the larger the risk.