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This is really two questions:
1. When is the amount I pay towards the jackpot +EV for the prize?
2. How does it affect my win rate vs. a normal non-drop game?
While #1 could be +EV, it could make #2 -EV and vice versa.
Think of it more like a carribean stud jp drop. At a certain point it becomes +EV. Same idea. Or for that matter, the lottery.
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1)
http://www.bonuswhores.com/party-poker.php. Although, as I said, these numbers will be fine tuned relatively soon.
2) Your WR just from poker will be lower, but your overall long-run win rate, including promotions, will be higher than if you had played a normal table. If the BBJ is below the above mentioned thresholds, then your WR, even with all long-run promotions figured in, will still be lower than if you had played a normal table.