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Anyone have any more knowledge about this?

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From PartyPoker terms:
2.8 "Gross Revenue" is calculated as the sum total of all Players' contribution to all "rakes" the Players contributed to while playing on our poker tables on the Website, less any credits, bonus or promotional amounts given to Players, processing charges, charge backs, and any other un-collectable revenue or deductions we are entitled to make in respect of that Player according to our Standard Terms and Conditions of Use. Moreover, a Player's contribution to the "rakes" shall be determined as the number obtained when dividing the actual amount of each rake to which the Player had contributed divided by the total number of players at the table at the start of the hand. So (for illustration purposes only and without limitation) if the rake in a hand with ten players at the table is three dollars ($3.00), each player's contribution to the rake will be thirty cents ($0.30).