25th Annivesary RPTQ - Judge as a team member
Rather an unusual scenario, to be sure - but it's not a concern.
If a player approaches a judge before the PPTQ is over and makes such an offer, there is likely to be a perception of bias among other players; I'll even admit that, in some unfortunate circumstances, it could create a bias for a judge who now really wants that player to win. Let's go ahead and say, in this public forum, that this sort of thing should never happen, and any judge who receives such an offer should clearly and absolutely refuse it.
However, once the PPTQ is over? There's no further concern, and really no good way to police it, anyway. The only potential for concern is perception by some that maybe the offer happened before or during the PPTQ; public perception is - as we all experience at times - a very fickle and uncontrolled thing. Still, if this were to actually happen, it'd be acceptable.
d:^D