sarbox68 - you're pretty exactly wrong. Winnings and ptbb/100 are calculated on the difference between what you put in the pot and take away from the pot - when pots are given to you rake has been deducted. PT does not manually deduct it from your winnings - but it's basing winnings on a number that is already less rake.

So yeah if the math is right (didn't check) your win rate with a normal rake would be 8 ptbb/100. Also if you have rakeback your win rate becomes maybe 10 ptbb/100.