Most people don't play +ev strategies or don't want to invest the time to go into them. Poker can be easily +ev in lower stakes... investing in a casino's bankroll, but the problem is that probably a lot of these gamblers either don't want to do it or don't have the "time" to do that... Actually, most probably don't have enough funds to make a significant profit in investing. Or, the impatience could be the driving factor.

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It doesn't matter: the statistically ignorant masses drive the economy!