i don't necessarily disagree, but your figures seem quite low.
>>The past week, there has been ~670 btc wagered on Betking. That is an expected profit of 6.7 btc/week, or $5,000 per week
my personal returns for the past 60 days was an average of 1.5 BTC per month, and i was about 1% of the bankroll. So i would guesstimate its about 35 BTC per week, not 6.7.
He means expected value. The site was supposed to make only 6.7 BTC in "theory".. but the site has been super lucky so you made more than theory.