After a few days of betting, player called "zhent" managed to somehow win 200 BTC at betking.io What are your thoughts how is it possible some people manage to win so much? Just a matter of luck or is it the bankroll that is the key? It's very difficult to win with a very limited bankroll and it's coming from experience 
A post of the winner on BetKing thread: https://bitcointalk.org/index.php?topic=910134.msg13880555#msg13880555
http://i.imgur.com/eJVBrl7.png
A post of the winner on BetKing thread: https://bitcointalk.org/index.php?topic=910134.msg13880555#msg13880555
http://i.imgur.com/eJVBrl7.png
Just remember if you want to get a big amount of profit you sure need bankroll, dont expect something high if you only play with small bankroll, it will not possible to win such huge amount with such small bankroll and second thing you need luck when it comes to gambling no matter what. So as I can say bankroll and luck is both important thing that you need to achieve huge profit