I am in the process of getting more specifics. As it stands now, it seems as though point redemptions, chargebacks, bonuses, and a 5% fee are deducted from the MGR.
You can read it in the affiliate agreement here:
This has been in the affiliate agreement for quite some time now!
https://secure.partypartners.com/legal.htm
Click on percentage plan in:
You can choose between two Payment Plans. The Payment Plan that you choose will apply to all Sites within the Affiliate Network.
Per Sign Up Plan
Percentage Plan Will lead you to:
https://secure.partypartners.com/why_join/rev_share.htm
Click on: Monthly Poker Revenues
This will open a pop-up window which gives details.