~
Confused as how come 75 Bitcoins was 590k USD, and 106 btc paid out was 430k USD.
75BTC wins worth 590k and it happened in one day.
Bitcoin price fluctuates in 3 years period and signature rates are calculated in USD fixed. So, participants sometimes get reward 0.013btc/week, and few weeks later receive 0.0245btc/week, depends on BTC price.