That is certainly an eye-opener, and puts a lot of doubt on the reliance of casinos on whales. You profitability is much higher in the latter part of the year, with much lower wagering.
That's because we had one huge whale and he kicked our asses...
We did better once he stopped playing, it's true.
Your return on any given day ranges from 18.73% to -12.60%
That's profit as a percentage of the amount wagered?
I try to use "return" to mean the profit as a percentage of the bankroll, because that's the return the people bankrolling the site get. If only 1 BTC is bet one day and the bet loses, that's a 100% profit in terms of the amount wagered, but approximately 0% return to the bankrollers. (100 * 1/50000 ~= 0)