why casino is always profitable bcoz most people will lose and that is a true 
Casino's are always profitable even if somebody wins because the way casino plays they will let someone win and the other lose but their are plenty times for the losing part, and casino's tend to let you will at first but will let you lose on the end.
Casinos are not afraid of you winning their money but they are more afraid of you not betting with them. When you bet more often, you have a higher chance to lose with the house edge. This is one of the reason why casinos give you freebies to encourage you to return to bet.
Do not play gamble is the best choice. Even the casino owner itself know, they will lose when they bet againts the house edge.
More bets you make, more chances you will lose. That is the fact.
Well the good thing about Bitcoin is you can find probability fair games and you can not only find those but check the code and verify that the transactions are indeed valid, in this sense Bitcoin gambling is way safer than going into a rigged casino where they will never show you the insides of the machines.