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I don't understand all these blackjack posts. Why are 2+2ers playing blackjack online, a -EV game? And I see people saying things like, "I was up $500/$5000", which means people aren't just messing around, they are betting large amounts.

If some are up $500 or $5000, then others are down the same amount.

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You're actually quite wrong. Most (if not all) 2+2ers play BJ to clear casino bonuses, something that's very +EV.