[Guthrie]

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started with $400 ($200 sticky bonus) and it's now down to $347.

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You're up, not down. You only put in $200 and you got a $200 bonus. You're up $147. If you have played enough hands to clear the bonus, cash out now, and you made a profit of $147. Find another site. Rinse. Repeat.

You cannot beat blackjack without counting cards. Counting cards is worthless online because they shuffle after every hand. Therefore you cannot beat online blackjack.

You can make a profit, however, by taking their bonus money and quitting as soon as you clear the bonus. You have to play perfect basic strategy to keep the most bonus, and your chance of losing any of your actual buy-in (not the bonus) is quite small.

There's no reason for them to rig the game. Only bonus whores will quit after they clear the bonus. Most people will continue playing long after, until they lose the bonus and their buy-in.