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.
Yes, for keeping you sticking with gambling, the freebies are important in the view of gambling houses. Their withdrawal fees are usually higher than these freebies. Yes, even with freebies, there would not be any losses for gambling houses. They are more conscious on this.