The Opportunity To Win
There is only one way to actually win at an online casino and it may come as a shock. The only way that you are able to win at an online casino, is to actually join an online casino and to spend your money there. If you are not willing to spend money in order to make money then you have no reason to complain about the casino costs. You need to think about the fact that the casino is there to make money just like you are. If the casino were to only hand out money without charging membership fees or to play the games, then the casino would cease to exist in no time.
This is how it is able to make money at all. If the casino provides a means to entertain that also has a slight chance to provide you with money then that is what they will do.