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Yeah coz we need lots of additives to make a win,with statistics of each players this will give another chance.as we know it's the luck that gives the advantage in gambling (ofcourse with knowledge of the games also)
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If you mean just the rules, and not some imaginable flaws that can help you to win a game, then it's actually a good point. Until recently I'd been thinking I knew all the games but I apparently I was so wrong. I realized that when I started playing free rolls on a poker site with all this range of various games I'd never heard of before: Stud, Razz, 2-7 Triple Draw, HORSE, Badugi, Badeucy, you name it. I still can't remember all the rules for all those games, and that's exactly why I lose in many cases. So yeah, knowing the games is a top priority.