The best models come from starting with an explanation of the least common common occurrence in a body of occurrences and then working inwards. People who do the opposite are not really explaining anything, they're just betting on "house" in a gambling den.
Poker is winnable but extremely tough these days to the point the average person has little to gain from trying to learn it. Blackjack is winnable with counting systems in a small number of contexts. Video poker is winnable with a sufficient bankroll. Everything else -EV p much.