Accumulated percentages only apply when you look at the probability of a
continuous string of wins, not a discrete outcome. Casinos win because each discrete outcome is to their advantage. After thousands of plays, they will be ahead because a 2% advantage shows up the more often gamblers play.
Each individual play has the same odds as the one before. Sports is a great example of how we miss this when assuming a player with a string of baskets has a better chance of sinking the next throw, when in fact, the next throw has the same chance as the first.
Sorry to digress. Maybe this falls under the "and more" category of topics.