Even if we know that the gambling site is fair, it won't affect the fact that we still lose more in those sites than win. But it's not that useless of an addition, at the least we know that the sites we're playing in are fair, right?
It is true that most of the result when we gamble is always lose. Only fool will think that the win are more than lose. Not all gamblers are gambling just for a chance to win big time as some gamblers are looking for fun, excitement, thrill and more. Well yeah, at least the site is fair so those who are looking for fun won't be a problem.
If we compare the result between we win or the casino win, surely the casino will take the biggest money because they can get it from many gamblers while if we win, we only get a small part from them. Besides that, many gamblers will play gambling every day in various gambling games, so the casino's chance to win big money will be wide open. Well, one or more gamblers can win a lot of money but that will happen many times as most gamblers will lose their money.