I know the majority of people on here don't like or respect towtoad/Nakowa/or whatever he wants his name to be, but I think you do have to respect his winnings. Doing it once or twice might have been luck, but it appears he has found a way to consistently beat the game and that is not going to change any time soon IMO.
He doesn't win every time he plays. He's had losing sessions in the past. He's got a big bankroll and isn't afraid to risk it. This is normal variance for low-edge, even-money bets between 100 and 500 BTC.