[Piers]

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Do you want the long answer or the short answer? The short answer is, if you are smart enough to ask this question, it is almost certain that you generate more rake back at Party than at Poker Room

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I suspect it depends at what limit your playing. At 5/10 or lower the Pokerroom.com rake is significantly higher than Party (or any other site). Hence I would expect you to be generating more rakeback at those limits at Pokerroom.com, or at least the calculation is very complicated. At 10.20 or higher this is no longer true.

To rephrase: I assume AAAA is right that you will be generating a higher proportion of the total rake at Party but at 5/10 or lower that is a higher proportion of a lower total value.