Hypothetical situation

[robinsons]

I can't see this being a regular thing. the major problem with this is (non-rakeback) affiliates.
This bonus you earn will have to be removed from your MGR to such an extent that your MGR is almost worthless. This will not be acceptable to affiliates.
If the MGR is still a decent amount, you will still have affiliates offering rakeback (with or without the approval of party), and it will be worthwhile to have.

The crux of the matter is that if you offer affiliates a % of MGR as a payment option, then there will be people offering rakeback. Then the only choice party has is how hard they crack down on people offering it.