Thank you, we just updated your information.

legera, $150k worth of bids is placed over the course of 27 days EtherSphere v1.0 was run. The game fundamentally involves having players bid for a reward pool which has variable amount of ethers, depending on how much was bid in total during the previous round. Bids roll over to the next day and as bid pool increases, the reward pool will increase as well, in turn attracting more players.

The whitepaper actually does explain how this work under the game theory and mechanics section. Additionally, there's an article which describes everything in detail:

https://medium.com/tim-marsh/ut-your-money-where-your-mind-is-ethersphere-v2-0-1ab14995c7bd