Pshabi or TP, feel free to correct me if I'm wrong:
During the bonus period, when a player receives a bonus directly from the site itself (ie: Empire giving you $100 to clear 10x), that money is subtracted from your rakeback total because it is charged against the affiliate.
I don't think this is the modus operandi for every single website, but I recall it being in place for Party/Skins.
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