Personally, I never play Re-buys. I just don't like the idea. If you lose, you lose, I don't think that you should get another chance. Especially when the extra money isn't going to the prize pool. This is why I strictly play freezeout tourneys (also because I don't have much money
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I can however see how re-buy tourneys would be attractive for some players. If you have a bigger bankroll then you can risk losing once or twice in order to get a nice big stack.