It’s an interesting idea, yet another way of getting around Partys anti-rakeback stance, and at very low risk for the affiliate. Actually, at no risk of the affiliate, because if they have negative MGR then no skin off his nose.
Of course the problem is that the 3/6 and above grinders could be the ons that generate all the MGR….then the better tournament players(who probably mainly play SNGs) can jump right in and play in a very +EV tournament.